{"abstract":"Posting a new entry reuses the id of a voided entry and resurrects it.","category":"Double-entry ledger accounting","checks":7,"contract":"x = [['post', id, amount] | ['void', target_id, reversal_id] | other]. Posting an existing id is an error 'duplicate'. Voiding needs a known target ('unknown'), whose status is 'posted' ('not_voidable' for voided entries and reversals) and an unused reversal id ('duplicate'), checked in that order. A void marks the target 'voided' and creates a 'reversal' entry with the negated amount. Other commands give 'bad_command'. Return {'status', 'balance': sum of all amounts, 'errors': [[index, reason]]}.","evaluation_group":"w2-double-entry-ledger-accounting-void-reversal-linkage","failed_approach":"Excluding only reversals still lets posts overwrite reversal entries.","family":"w2-double-entry-ledger-accounting-void-reversal-linkage-duplicate-post-detection","id":"FA-58211","implementations":{"attempt":{"sha256":"3e458306283bf2c44df893c1f6dd80fd165bce9589b6a46f417c3ef1caa8a7fa","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(x):\n    status = {}\n    amounts = {}\n    errors = []\n    for i, cmd in enumerate(x):\n        if cmd[0] == 'post':\n            _, eid, amt = cmd\n            if eid in status and status[eid] != 'reversal':\n                errors.append([i, 'duplicate'])\n                continue\n            status[eid] = 'posted'\n            amounts[eid] = amt\n        elif cmd[0] == 'void':\n            _, target, new = cmd\n            if target not in status:\n                errors.append([i, 'unknown'])\n            elif status[target] != 'posted':\n                errors.append([i, 'not_voidable'])\n            elif new in status:\n                errors.append([i, 'duplicate'])\n            else:\n                status[target] = 'voided'\n                status[new] = 'reversal'\n                amounts[new] = -amounts[target]\n        else:\n            errors.append([i, 'bad_command'])\n    return {'status': status, 'balance': sum(amounts.values()), 'errors': errors}\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\nfixtures = [[['regression: duplicate post detection', [['post', 'A', 999], ['post', 'D', -40], ['void', 'R1', 'R1'], ['post', 'B', 999], ['void', 'B', 'R3'], ['post', 'R1', 999], ['post', 'B', 250]], {'status': {'A': 'posted', 'D': 'posted', 'B': 'voided', 'R3': 'reversal', 'R1': 'posted'}, 'balance': 1958, 'errors': [[2, 'unknown'], [6, 'duplicate']]}], ['regression: duplicate post detection, partial-repair probe', [['post', 'D', 999], ['void', 'D', 'R1'], ['void', 'C', 'R3'], ['void', 'A', 'D'], ['post', 'A', 100], ['post', 'R1', -40], ['post', 'C', 999], ['post', 'B', 999]], {'status': {'D': 'voided', 'R1': 'reversal', 'A': 'posted', 'C': 'posted', 'B': 'posted'}, 'balance': 2098, 'errors': [[2, 'unknown'], [3, 'unknown'], [5, 'duplicate']]}], ['control 1', [['edit', 'A', 5], ['post', 'C', 999], ['void', 'C', 'R2'], ['void', 'R3', 'D']], {'status': {'C': 'voided', 'R2': 'reversal'}, 'balance': 0, 'errors': [[0, 'bad_command'], [3, 'unknown']]}], ['control 2', [['post', 'R1', -40], ['post', 'R1', 100], ['post', 'D', 999], ['edit', 'A', 5], ['void', 'R1', 'D'], ['void', 'R1', 'R2'], ['post', 'D', 999], ['void', 'R1', 'R1']], {'status': {'R1': 'voided', 'D': 'posted', 'R2': 'reversal'}, 'balance': 999, 'errors': [[1, 'duplicate'], [3, 'bad_command'], [4, 'duplicate'], [6, 'duplicate'], [7, 'not_voidable']]}], ['control 3', [['post', 'C', 250], ['edit', 'A', 5], ['edit', 'A', 5], ['void', 'R1', 'D']], {'status': {'C': 'posted'}, 'balance': 250, 'errors': [[1, 'bad_command'], [2, 'bad_command'], [3, 'unknown']]}], ['control 4', [['post', 'C', 100], ['post', 'D', 100], ['post', 'R1', 250], ['post', 'B', 250], ['void', 'C', 'R2'], ['void', 'B', 'R2']], {'status': {'C': 'voided', 'D': 'posted', 'R1': 'posted', 'B': 'posted', 'R2': 'reversal'}, 'balance': 600, 'errors': [[5, 'duplicate']]}], ['control 5', [['void', 'R2', 'D'], ['post', 'D', 999], ['post', 'D', 999], ['post', 'R1', 100], ['void', 'A', 'D']], {'status': {'D': 'posted', 'R1': 'posted'}, 'balance': 1099, 'errors': [[0, 'unknown'], [2, 'duplicate'], [4, 'unknown']]}]], [['regression: duplicate post detection', [['post', 'D', 250], ['void', 'C', 'R2'], ['void', 'D', 'R3'], ['post', 'C', -40], ['post', 'C', 250], ['post', 'D', 999], ['post', 'A', -40], ['post', 'A', -40]], {'status': {'D': 'voided', 'R3': 'reversal', 'C': 'posted', 'A': 'posted'}, 'balance': -80, 'errors': [[1, 'unknown'], [4, 'duplicate'], [5, 'duplicate'], [7, 'duplicate']]}], ['regression: duplicate post detection, partial-repair probe', [['post', 'B', -40], ['post', 'B', 250], ['void', 'B', 'R1'], ['post', 'R1', 100], ['post', 'C', -40], ['void', 'R1', 'R3'], ['post', 'A', 250], ['void', 'R1', 'R1']], {'status': {'B': 'voided', 'R1': 'reversal', 'C': 'posted', 'A': 'posted'}, 'balance': 210, 'errors': [[1, 'duplicate'], [3, 'duplicate'], [5, 'not_voidable'], [7, 'not_voidable']]}], ['control 1', [['post', 'B', 250], ['post', 'C', 250], ['edit', 'A', 5], ['post', 'B', 250], ['post', 'B', 100]], {'status': {'B': 'posted', 'C': 'posted'}, 'balance': 500, 'errors': [[2, 'bad_command'], [3, 'duplicate'], [4, 'duplicate']]}], ['control 2', [['post', 'B', 250], ['void', 'D', 'R3'], ['post', 'D', -40], ['post', 'A', -40], ['void', 'R3', 'R1'], ['void', 'R2', 'R3'], ['post', 'R1', -40], ['void', 'B', 'R1']], {'status': {'B': 'posted', 'D': 'posted', 'A': 'posted', 'R1': 'posted'}, 'balance': 130, 'errors': [[1, 'unknown'], [4, 'unknown'], [5, 'unknown'], [7, 'duplicate']]}], ['control 3', [['post', 'R1', -40], ['post', 'B', 250], ['post', 'C', 250], ['void', 'R2', 'R3']], {'status': {'R1': 'posted', 'B': 'posted', 'C': 'posted'}, 'balance': 460, 'errors': [[3, 'unknown']]}], ['control 4', [['post', 'A', 999], ['void', 'R1', 'R3'], ['void', 'R2', 'R2'], ['post', 'R1', 999]], {'status': {'A': 'posted', 'R1': 'posted'}, 'balance': 1998, 'errors': [[1, 'unknown'], [2, 'unknown']]}], ['control 5', [['void', 'C', 'D'], ['void', 'D', 'R1'], ['void', 'R3', 'D'], ['post', 'A', -40], ['post', 'D', 999], ['post', 'C', -40], ['void', 'R1', 'R3']], {'status': {'A': 'posted', 'D': 'posted', 'C': 'posted'}, 'balance': 919, 'errors': [[0, 'unknown'], [1, 'unknown'], [2, 'unknown'], [6, 'unknown']]}]], [['regression: duplicate post detection', [['void', 'B', 'D'], ['post', 'C', -40], ['void', 'C', 'R2'], ['void', 'R3', 'R2'], ['post', 'R1', 100], ['post', 'C', -40], ['void', 'R2', 'D']], {'status': {'C': 'voided', 'R2': 'reversal', 'R1': 'posted'}, 'balance': 100, 'errors': [[0, 'unknown'], [3, 'unknown'], [5, 'duplicate'], [6, 'not_voidable']]}], ['regression: duplicate post detection, partial-repair probe', [['post', 'A', 999], ['void', 'A', 'R1'], ['post', 'R1', 999], ['post', 'D', 250], ['void', 'R2', 'R1'], ['post', 'B', 100], ['void', 'R1', 'R3']], {'status': {'A': 'voided', 'R1': 'reversal', 'D': 'posted', 'B': 'posted'}, 'balance': 350, 'errors': [[2, 'duplicate'], [4, 'unknown'], [6, 'not_voidable']]}], ['control 1', [['void', 'R1', 'R3'], ['void', 'A', 'R3'], ['void', 'R3', 'R1']], {'status': {}, 'balance': 0, 'errors': [[0, 'unknown'], [1, 'unknown'], [2, 'unknown']]}], ['control 2', [['void', 'C', 'R3'], ['void', 'R1', 'R3'], ['void', 'R2', 'R1'], ['void', 'R1', 'R1'], ['void', 'C', 'D'], ['void', 'A', 'R1'], ['post', 'D', 999]], {'status': {'D': 'posted'}, 'balance': 999, 'errors': [[0, 'unknown'], [1, 'unknown'], [2, 'unknown'], [3, 'unknown'], [4, 'unknown'], [5, 'unknown']]}], ['control 3', [['post', 'D', -40], ['void', 'R3', 'R1'], ['post', 'B', 100], ['post', 'R1', 250], ['void', 'C', 'D'], ['post', 'A', 999], ['void', 'R2', 'R2']], {'status': {'D': 'posted', 'B': 'posted', 'R1': 'posted', 'A': 'posted'}, 'balance': 1309, 'errors': [[1, 'unknown'], [4, 'unknown'], [6, 'unknown']]}], ['control 4', [['edit', 'A', 5], ['post', 'R1', -40], ['post', 'C', 100], ['post', 'C', 100], ['post', 'R1', 100], ['void', 'R2', 'D'], ['post', 'B', -40]], {'status': {'R1': 'posted', 'C': 'posted', 'B': 'posted'}, 'balance': 20, 'errors': [[0, 'bad_command'], [3, 'duplicate'], [4, 'duplicate'], [5, 'unknown']]}], ['control 5', [['void', 'R3', 'R1'], ['post', 'D', -40], ['void', 'R3', 'R1'], ['post', 'R1', 100], ['post', 'A', 250], ['void', 'R1', 'R3'], ['void', 'A', 'D'], ['void', 'R1', 'R1']], {'status': {'D': 'posted', 'R1': 'voided', 'A': 'posted', 'R3': 'reversal'}, 'balance': 210, 'errors': [[0, 'unknown'], [2, 'unknown'], [6, 'duplicate'], [7, 'not_voidable']]}]], [['regression: duplicate post detection', [['void', 'R3', 'R2'], ['post', 'R1', -40], ['post', 'D', 999], ['void', 'D', 'R2'], ['post', 'A', 999], ['post', 'D', 999]], {'status': {'R1': 'posted', 'D': 'voided', 'R2': 'reversal', 'A': 'posted'}, 'balance': 959, 'errors': [[0, 'unknown'], [5, 'duplicate']]}], ['regression: duplicate post detection, partial-repair probe', [['void', 'R2', 'R3'], ['post', 'B', 100], ['void', 'B', 'D'], ['void', 'R3', 'R3'], ['post', 'A', 100], ['post', 'D', 250]], {'status': {'B': 'voided', 'D': 'reversal', 'A': 'posted'}, 'balance': 100, 'errors': [[0, 'unknown'], [3, 'unknown'], [5, 'duplicate']]}], ['control 1', [['void', 'A', 'R1'], ['void', 'A', 'R1'], ['void', 'B', 'R3'], ['post', 'C', 100], ['post', 'B', -40], ['edit', 'A', 5], ['void', 'R2', 'D']], {'status': {'C': 'posted', 'B': 'posted'}, 'balance': 60, 'errors': [[0, 'unknown'], [1, 'unknown'], [2, 'unknown'], [5, 'bad_command'], [6, 'unknown']]}], ['control 2', [['void', 'D', 'R1'], ['post', 'D', -40], ['post', 'A', 100], ['void', 'A', 'R1'], ['void', 'A', 'R3']], {'status': {'D': 'posted', 'A': 'voided', 'R1': 'reversal'}, 'balance': -40, 'errors': [[0, 'unknown'], [4, 'not_voidable']]}], ['control 3', [['void', 'D', 'R2'], ['void', 'R3', 'R3'], ['post', 'B', 250], ['void', 'D', 'D'], ['post', 'C', 999], ['post', 'B', -40]], {'status': {'B': 'posted', 'C': 'posted'}, 'balance': 1249, 'errors': [[0, 'unknown'], [1, 'unknown'], [3, 'unknown'], [5, 'duplicate']]}], ['control 4', [['post', 'R1', -40], ['void', 'D', 'R1'], ['post', 'A', 250], ['void', 'R1', 'D']], {'status': {'R1': 'voided', 'A': 'posted', 'D': 'reversal'}, 'balance': 250, 'errors': [[1, 'unknown']]}], ['control 5', [['edit', 'A', 5], ['edit', 'A', 5], ['post', 'D', 100], ['post', 'B', 999]], {'status': {'D': 'posted', 'B': 'posted'}, 'balance': 1099, 'errors': [[0, 'bad_command'], [1, 'bad_command']]}]], [['regression: duplicate post detection', [['void', 'D', 'R3'], ['void', 'D', 'D'], ['edit', 'A', 5], ['post', 'B', 999], ['post', 'D', 250], ['void', 'B', 'R3'], ['post', 'R1', 999], ['post', 'B', 250]], {'status': {'B': 'voided', 'D': 'posted', 'R3': 'reversal', 'R1': 'posted'}, 'balance': 1249, 'errors': [[0, 'unknown'], [1, 'unknown'], [2, 'bad_command'], [7, 'duplicate']]}], ['regression: duplicate post detection, partial-repair probe', [['void', 'C', 'D'], ['post', 'B', 100], ['void', 'B', 'R1'], ['post', 'R1', 999], ['void', 'R3', 'D'], ['void', 'R2', 'R3'], ['void', 'B', 'R2'], ['void', 'R3', 'R1']], {'status': {'B': 'voided', 'R1': 'reversal'}, 'balance': 0, 'errors': [[0, 'unknown'], [3, 'duplicate'], [4, 'unknown'], [5, 'unknown'], [6, 'not_voidable'], [7, 'unknown']]}], ['control 1', [['void', 'R2', 'R1'], ['void', 'B', 'D'], ['post', 'C', 250]], {'status': {'C': 'posted'}, 'balance': 250, 'errors': [[0, 'unknown'], [1, 'unknown']]}], ['control 2', [['void', 'A', 'R1'], ['post', 'A', -40], ['post', 'A', -40], ['post', 'A', 999], ['void', 'R1', 'R2']], {'status': {'A': 'posted'}, 'balance': -40, 'errors': [[0, 'unknown'], [2, 'duplicate'], [3, 'duplicate'], [4, 'unknown']]}], ['control 3', [['post', 'B', 250], ['post', 'D', 100], ['post', 'A', 999], ['post', 'D', -40]], {'status': {'B': 'posted', 'D': 'posted', 'A': 'posted'}, 'balance': 1349, 'errors': [[3, 'duplicate']]}], ['control 4', [['void', 'C', 'R2'], ['void', 'B', 'R3'], ['void', 'R1', 'R2'], ['void', 'D', 'D'], ['void', 'R3', 'R2'], ['post', 'C', 250], ['post', 'A', 999], ['post', 'R1', 100]], {'status': {'C': 'posted', 'A': 'posted', 'R1': 'posted'}, 'balance': 1349, 'errors': [[0, 'unknown'], [1, 'unknown'], [2, 'unknown'], [3, 'unknown'], [4, 'unknown']]}], ['control 5', [['void', 'R1', 'R3'], ['post', 'C', 999], ['post', 'R1', -40], ['post', 'D', 999], ['post', 'A', 250], ['post', 'B', 250], ['void', 'R2', 'D']], {'status': {'C': 'posted', 'R1': 'posted', 'D': 'posted', 'A': 'posted', 'B': 'posted'}, 'balance': 2458, 'errors': [[0, 'unknown'], [6, 'unknown']]}]]]\nfor label, args, expected in fixtures[N-1]:\n    try:\n        actual = solve(args)\n    except Exception as exc:\n        actual = 'raised ' + type(exc).__name__\n    check(label, actual, expected)\nprint(json.dumps({\"observations\": observations, \"passed\": all(x[\"passed\"] for x in observations)}, ensure_ascii=False))\nraise SystemExit(0 if all(x[\"passed\"] for x in observations) else 1)\n"},"broken":{"sha256":"5c8d0b1ebb497798494c3937ebc8365284d92ae92a0e9703d5a41884c2976a83","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(x):\n    status = {}\n    amounts = {}\n    errors = []\n    for i, cmd in enumerate(x):\n        if cmd[0] == 'post':\n            _, eid, amt = cmd\n            if eid in status and status[eid] == 'posted':\n                errors.append([i, 'duplicate'])\n                continue\n            status[eid] = 'posted'\n            amounts[eid] = amt\n        elif cmd[0] == 'void':\n            _, target, new = cmd\n            if target not in status:\n                errors.append([i, 'unknown'])\n            elif status[target] != 'posted':\n                errors.append([i, 'not_voidable'])\n            elif new in status:\n                errors.append([i, 'duplicate'])\n            else:\n                status[target] = 'voided'\n                status[new] = 'reversal'\n                amounts[new] = -amounts[target]\n        else:\n            errors.append([i, 'bad_command'])\n    return {'status': status, 'balance': sum(amounts.values()), 'errors': errors}\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\nfixtures = [[['regression: duplicate post detection', [['post', 'A', 999], ['post', 'D', -40], ['void', 'R1', 'R1'], ['post', 'B', 999], ['void', 'B', 'R3'], ['post', 'R1', 999], ['post', 'B', 250]], {'status': {'A': 'posted', 'D': 'posted', 'B': 'voided', 'R3': 'reversal', 'R1': 'posted'}, 'balance': 1958, 'errors': [[2, 'unknown'], [6, 'duplicate']]}], ['regression: duplicate post detection, partial-repair probe', [['post', 'D', 999], ['void', 'D', 'R1'], ['void', 'C', 'R3'], ['void', 'A', 'D'], ['post', 'A', 100], ['post', 'R1', -40], ['post', 'C', 999], ['post', 'B', 999]], {'status': {'D': 'voided', 'R1': 'reversal', 'A': 'posted', 'C': 'posted', 'B': 'posted'}, 'balance': 2098, 'errors': [[2, 'unknown'], [3, 'unknown'], [5, 'duplicate']]}], ['control 1', [['edit', 'A', 5], ['post', 'C', 999], ['void', 'C', 'R2'], ['void', 'R3', 'D']], {'status': {'C': 'voided', 'R2': 'reversal'}, 'balance': 0, 'errors': [[0, 'bad_command'], [3, 'unknown']]}], ['control 2', [['post', 'R1', -40], ['post', 'R1', 100], ['post', 'D', 999], ['edit', 'A', 5], ['void', 'R1', 'D'], ['void', 'R1', 'R2'], ['post', 'D', 999], ['void', 'R1', 'R1']], {'status': {'R1': 'voided', 'D': 'posted', 'R2': 'reversal'}, 'balance': 999, 'errors': [[1, 'duplicate'], [3, 'bad_command'], [4, 'duplicate'], [6, 'duplicate'], [7, 'not_voidable']]}], ['control 3', [['post', 'C', 250], ['edit', 'A', 5], ['edit', 'A', 5], ['void', 'R1', 'D']], {'status': {'C': 'posted'}, 'balance': 250, 'errors': [[1, 'bad_command'], [2, 'bad_command'], [3, 'unknown']]}], ['control 4', [['post', 'C', 100], ['post', 'D', 100], ['post', 'R1', 250], ['post', 'B', 250], ['void', 'C', 'R2'], ['void', 'B', 'R2']], {'status': {'C': 'voided', 'D': 'posted', 'R1': 'posted', 'B': 'posted', 'R2': 'reversal'}, 'balance': 600, 'errors': [[5, 'duplicate']]}], ['control 5', [['void', 'R2', 'D'], ['post', 'D', 999], ['post', 'D', 999], ['post', 'R1', 100], ['void', 'A', 'D']], {'status': {'D': 'posted', 'R1': 'posted'}, 'balance': 1099, 'errors': [[0, 'unknown'], [2, 'duplicate'], [4, 'unknown']]}]], [['regression: duplicate post detection', [['post', 'D', 250], ['void', 'C', 'R2'], ['void', 'D', 'R3'], ['post', 'C', -40], ['post', 'C', 250], ['post', 'D', 999], ['post', 'A', -40], ['post', 'A', -40]], {'status': {'D': 'voided', 'R3': 'reversal', 'C': 'posted', 'A': 'posted'}, 'balance': -80, 'errors': [[1, 'unknown'], [4, 'duplicate'], [5, 'duplicate'], [7, 'duplicate']]}], ['regression: duplicate post detection, partial-repair probe', [['post', 'B', -40], ['post', 'B', 250], ['void', 'B', 'R1'], ['post', 'R1', 100], ['post', 'C', -40], ['void', 'R1', 'R3'], ['post', 'A', 250], ['void', 'R1', 'R1']], {'status': {'B': 'voided', 'R1': 'reversal', 'C': 'posted', 'A': 'posted'}, 'balance': 210, 'errors': [[1, 'duplicate'], [3, 'duplicate'], [5, 'not_voidable'], [7, 'not_voidable']]}], ['control 1', [['post', 'B', 250], ['post', 'C', 250], ['edit', 'A', 5], ['post', 'B', 250], ['post', 'B', 100]], {'status': {'B': 'posted', 'C': 'posted'}, 'balance': 500, 'errors': [[2, 'bad_command'], [3, 'duplicate'], [4, 'duplicate']]}], ['control 2', [['post', 'B', 250], ['void', 'D', 'R3'], ['post', 'D', -40], ['post', 'A', -40], ['void', 'R3', 'R1'], ['void', 'R2', 'R3'], ['post', 'R1', -40], ['void', 'B', 'R1']], {'status': {'B': 'posted', 'D': 'posted', 'A': 'posted', 'R1': 'posted'}, 'balance': 130, 'errors': [[1, 'unknown'], [4, 'unknown'], [5, 'unknown'], [7, 'duplicate']]}], ['control 3', [['post', 'R1', -40], ['post', 'B', 250], ['post', 'C', 250], ['void', 'R2', 'R3']], {'status': {'R1': 'posted', 'B': 'posted', 'C': 'posted'}, 'balance': 460, 'errors': [[3, 'unknown']]}], ['control 4', [['post', 'A', 999], ['void', 'R1', 'R3'], ['void', 'R2', 'R2'], ['post', 'R1', 999]], {'status': {'A': 'posted', 'R1': 'posted'}, 'balance': 1998, 'errors': [[1, 'unknown'], [2, 'unknown']]}], ['control 5', [['void', 'C', 'D'], ['void', 'D', 'R1'], ['void', 'R3', 'D'], ['post', 'A', -40], ['post', 'D', 999], ['post', 'C', -40], ['void', 'R1', 'R3']], {'status': {'A': 'posted', 'D': 'posted', 'C': 'posted'}, 'balance': 919, 'errors': [[0, 'unknown'], [1, 'unknown'], [2, 'unknown'], [6, 'unknown']]}]], [['regression: duplicate post detection', [['void', 'B', 'D'], ['post', 'C', -40], ['void', 'C', 'R2'], ['void', 'R3', 'R2'], ['post', 'R1', 100], ['post', 'C', -40], ['void', 'R2', 'D']], {'status': {'C': 'voided', 'R2': 'reversal', 'R1': 'posted'}, 'balance': 100, 'errors': [[0, 'unknown'], [3, 'unknown'], [5, 'duplicate'], [6, 'not_voidable']]}], ['regression: duplicate post detection, partial-repair probe', [['post', 'A', 999], ['void', 'A', 'R1'], ['post', 'R1', 999], ['post', 'D', 250], ['void', 'R2', 'R1'], ['post', 'B', 100], ['void', 'R1', 'R3']], {'status': {'A': 'voided', 'R1': 'reversal', 'D': 'posted', 'B': 'posted'}, 'balance': 350, 'errors': [[2, 'duplicate'], [4, 'unknown'], [6, 'not_voidable']]}], ['control 1', [['void', 'R1', 'R3'], ['void', 'A', 'R3'], ['void', 'R3', 'R1']], {'status': {}, 'balance': 0, 'errors': [[0, 'unknown'], [1, 'unknown'], [2, 'unknown']]}], ['control 2', [['void', 'C', 'R3'], ['void', 'R1', 'R3'], ['void', 'R2', 'R1'], ['void', 'R1', 'R1'], ['void', 'C', 'D'], ['void', 'A', 'R1'], ['post', 'D', 999]], {'status': {'D': 'posted'}, 'balance': 999, 'errors': [[0, 'unknown'], [1, 'unknown'], [2, 'unknown'], [3, 'unknown'], [4, 'unknown'], [5, 'unknown']]}], ['control 3', [['post', 'D', -40], ['void', 'R3', 'R1'], ['post', 'B', 100], ['post', 'R1', 250], ['void', 'C', 'D'], ['post', 'A', 999], ['void', 'R2', 'R2']], {'status': {'D': 'posted', 'B': 'posted', 'R1': 'posted', 'A': 'posted'}, 'balance': 1309, 'errors': [[1, 'unknown'], [4, 'unknown'], [6, 'unknown']]}], ['control 4', [['edit', 'A', 5], ['post', 'R1', -40], ['post', 'C', 100], ['post', 'C', 100], ['post', 'R1', 100], ['void', 'R2', 'D'], ['post', 'B', -40]], {'status': {'R1': 'posted', 'C': 'posted', 'B': 'posted'}, 'balance': 20, 'errors': [[0, 'bad_command'], [3, 'duplicate'], [4, 'duplicate'], [5, 'unknown']]}], ['control 5', [['void', 'R3', 'R1'], ['post', 'D', -40], ['void', 'R3', 'R1'], ['post', 'R1', 100], ['post', 'A', 250], ['void', 'R1', 'R3'], ['void', 'A', 'D'], ['void', 'R1', 'R1']], {'status': {'D': 'posted', 'R1': 'voided', 'A': 'posted', 'R3': 'reversal'}, 'balance': 210, 'errors': [[0, 'unknown'], [2, 'unknown'], [6, 'duplicate'], [7, 'not_voidable']]}]], [['regression: duplicate post detection', [['void', 'R3', 'R2'], ['post', 'R1', -40], ['post', 'D', 999], ['void', 'D', 'R2'], ['post', 'A', 999], ['post', 'D', 999]], {'status': {'R1': 'posted', 'D': 'voided', 'R2': 'reversal', 'A': 'posted'}, 'balance': 959, 'errors': [[0, 'unknown'], [5, 'duplicate']]}], ['regression: duplicate post detection, partial-repair probe', [['void', 'R2', 'R3'], ['post', 'B', 100], ['void', 'B', 'D'], ['void', 'R3', 'R3'], ['post', 'A', 100], ['post', 'D', 250]], {'status': {'B': 'voided', 'D': 'reversal', 'A': 'posted'}, 'balance': 100, 'errors': [[0, 'unknown'], [3, 'unknown'], [5, 'duplicate']]}], ['control 1', [['void', 'A', 'R1'], ['void', 'A', 'R1'], ['void', 'B', 'R3'], ['post', 'C', 100], ['post', 'B', -40], ['edit', 'A', 5], ['void', 'R2', 'D']], {'status': {'C': 'posted', 'B': 'posted'}, 'balance': 60, 'errors': [[0, 'unknown'], [1, 'unknown'], [2, 'unknown'], [5, 'bad_command'], [6, 'unknown']]}], ['control 2', [['void', 'D', 'R1'], ['post', 'D', -40], ['post', 'A', 100], ['void', 'A', 'R1'], ['void', 'A', 'R3']], {'status': {'D': 'posted', 'A': 'voided', 'R1': 'reversal'}, 'balance': -40, 'errors': [[0, 'unknown'], [4, 'not_voidable']]}], ['control 3', [['void', 'D', 'R2'], ['void', 'R3', 'R3'], ['post', 'B', 250], ['void', 'D', 'D'], ['post', 'C', 999], ['post', 'B', -40]], {'status': {'B': 'posted', 'C': 'posted'}, 'balance': 1249, 'errors': [[0, 'unknown'], [1, 'unknown'], [3, 'unknown'], [5, 'duplicate']]}], ['control 4', [['post', 'R1', -40], ['void', 'D', 'R1'], ['post', 'A', 250], ['void', 'R1', 'D']], {'status': {'R1': 'voided', 'A': 'posted', 'D': 'reversal'}, 'balance': 250, 'errors': [[1, 'unknown']]}], ['control 5', [['edit', 'A', 5], ['edit', 'A', 5], ['post', 'D', 100], ['post', 'B', 999]], {'status': {'D': 'posted', 'B': 'posted'}, 'balance': 1099, 'errors': [[0, 'bad_command'], [1, 'bad_command']]}]], [['regression: duplicate post detection', [['void', 'D', 'R3'], ['void', 'D', 'D'], ['edit', 'A', 5], ['post', 'B', 999], ['post', 'D', 250], ['void', 'B', 'R3'], ['post', 'R1', 999], ['post', 'B', 250]], {'status': {'B': 'voided', 'D': 'posted', 'R3': 'reversal', 'R1': 'posted'}, 'balance': 1249, 'errors': [[0, 'unknown'], [1, 'unknown'], [2, 'bad_command'], [7, 'duplicate']]}], ['regression: duplicate post detection, partial-repair probe', [['void', 'C', 'D'], ['post', 'B', 100], ['void', 'B', 'R1'], ['post', 'R1', 999], ['void', 'R3', 'D'], ['void', 'R2', 'R3'], ['void', 'B', 'R2'], ['void', 'R3', 'R1']], {'status': {'B': 'voided', 'R1': 'reversal'}, 'balance': 0, 'errors': [[0, 'unknown'], [3, 'duplicate'], [4, 'unknown'], [5, 'unknown'], [6, 'not_voidable'], [7, 'unknown']]}], ['control 1', [['void', 'R2', 'R1'], ['void', 'B', 'D'], ['post', 'C', 250]], {'status': {'C': 'posted'}, 'balance': 250, 'errors': [[0, 'unknown'], [1, 'unknown']]}], ['control 2', [['void', 'A', 'R1'], ['post', 'A', -40], ['post', 'A', -40], ['post', 'A', 999], ['void', 'R1', 'R2']], {'status': {'A': 'posted'}, 'balance': -40, 'errors': [[0, 'unknown'], [2, 'duplicate'], [3, 'duplicate'], [4, 'unknown']]}], ['control 3', [['post', 'B', 250], ['post', 'D', 100], ['post', 'A', 999], ['post', 'D', -40]], {'status': {'B': 'posted', 'D': 'posted', 'A': 'posted'}, 'balance': 1349, 'errors': [[3, 'duplicate']]}], ['control 4', [['void', 'C', 'R2'], ['void', 'B', 'R3'], ['void', 'R1', 'R2'], ['void', 'D', 'D'], ['void', 'R3', 'R2'], ['post', 'C', 250], ['post', 'A', 999], ['post', 'R1', 100]], {'status': {'C': 'posted', 'A': 'posted', 'R1': 'posted'}, 'balance': 1349, 'errors': [[0, 'unknown'], [1, 'unknown'], [2, 'unknown'], [3, 'unknown'], [4, 'unknown']]}], ['control 5', [['void', 'R1', 'R3'], ['post', 'C', 999], ['post', 'R1', -40], ['post', 'D', 999], ['post', 'A', 250], ['post', 'B', 250], ['void', 'R2', 'D']], {'status': {'C': 'posted', 'R1': 'posted', 'D': 'posted', 'A': 'posted', 'B': 'posted'}, 'balance': 2458, 'errors': [[0, 'unknown'], [6, 'unknown']]}]]]\nfor label, args, expected in fixtures[N-1]:\n    try:\n        actual = solve(args)\n    except Exception as exc:\n        actual = 'raised ' + type(exc).__name__\n    check(label, actual, expected)\nprint(json.dumps({\"observations\": observations, \"passed\": all(x[\"passed\"] for x in observations)}, ensure_ascii=False))\nraise SystemExit(0 if all(x[\"passed\"] for x in observations) else 1)\n"},"fixed":{"sha256":"d30e956f51cf48b84c8f29ca9406eb6a299069fd50622c36267c6a95c5f6d607","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(x):\n    status = {}\n    amounts = {}\n    errors = []\n    for i, cmd in enumerate(x):\n        if cmd[0] == 'post':\n            _, eid, amt = cmd\n            if eid in status:\n                errors.append([i, 'duplicate'])\n                continue\n            status[eid] = 'posted'\n            amounts[eid] = amt\n        elif cmd[0] == 'void':\n            _, target, new = cmd\n            if target not in status:\n                errors.append([i, 'unknown'])\n            elif status[target] != 'posted':\n                errors.append([i, 'not_voidable'])\n            elif new in status:\n                errors.append([i, 'duplicate'])\n            else:\n                status[target] = 'voided'\n                status[new] = 'reversal'\n                amounts[new] = -amounts[target]\n        else:\n            errors.append([i, 'bad_command'])\n    return {'status': status, 'balance': sum(amounts.values()), 'errors': errors}\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\nfixtures = [[['regression: duplicate post detection', [['post', 'A', 999], ['post', 'D', -40], ['void', 'R1', 'R1'], ['post', 'B', 999], ['void', 'B', 'R3'], ['post', 'R1', 999], ['post', 'B', 250]], {'status': {'A': 'posted', 'D': 'posted', 'B': 'voided', 'R3': 'reversal', 'R1': 'posted'}, 'balance': 1958, 'errors': [[2, 'unknown'], [6, 'duplicate']]}], ['regression: duplicate post detection, partial-repair probe', [['post', 'D', 999], ['void', 'D', 'R1'], ['void', 'C', 'R3'], ['void', 'A', 'D'], ['post', 'A', 100], ['post', 'R1', -40], ['post', 'C', 999], ['post', 'B', 999]], {'status': {'D': 'voided', 'R1': 'reversal', 'A': 'posted', 'C': 'posted', 'B': 'posted'}, 'balance': 2098, 'errors': [[2, 'unknown'], [3, 'unknown'], [5, 'duplicate']]}], ['control 1', [['edit', 'A', 5], ['post', 'C', 999], ['void', 'C', 'R2'], ['void', 'R3', 'D']], {'status': {'C': 'voided', 'R2': 'reversal'}, 'balance': 0, 'errors': [[0, 'bad_command'], [3, 'unknown']]}], ['control 2', [['post', 'R1', -40], ['post', 'R1', 100], ['post', 'D', 999], ['edit', 'A', 5], ['void', 'R1', 'D'], ['void', 'R1', 'R2'], ['post', 'D', 999], ['void', 'R1', 'R1']], {'status': {'R1': 'voided', 'D': 'posted', 'R2': 'reversal'}, 'balance': 999, 'errors': [[1, 'duplicate'], [3, 'bad_command'], [4, 'duplicate'], [6, 'duplicate'], [7, 'not_voidable']]}], ['control 3', [['post', 'C', 250], ['edit', 'A', 5], ['edit', 'A', 5], ['void', 'R1', 'D']], {'status': {'C': 'posted'}, 'balance': 250, 'errors': [[1, 'bad_command'], [2, 'bad_command'], [3, 'unknown']]}], ['control 4', [['post', 'C', 100], ['post', 'D', 100], ['post', 'R1', 250], ['post', 'B', 250], ['void', 'C', 'R2'], ['void', 'B', 'R2']], {'status': {'C': 'voided', 'D': 'posted', 'R1': 'posted', 'B': 'posted', 'R2': 'reversal'}, 'balance': 600, 'errors': [[5, 'duplicate']]}], ['control 5', [['void', 'R2', 'D'], ['post', 'D', 999], ['post', 'D', 999], ['post', 'R1', 100], ['void', 'A', 'D']], {'status': {'D': 'posted', 'R1': 'posted'}, 'balance': 1099, 'errors': [[0, 'unknown'], [2, 'duplicate'], [4, 'unknown']]}]], [['regression: duplicate post detection', [['post', 'D', 250], ['void', 'C', 'R2'], ['void', 'D', 'R3'], ['post', 'C', -40], ['post', 'C', 250], ['post', 'D', 999], ['post', 'A', -40], ['post', 'A', -40]], {'status': {'D': 'voided', 'R3': 'reversal', 'C': 'posted', 'A': 'posted'}, 'balance': -80, 'errors': [[1, 'unknown'], [4, 'duplicate'], [5, 'duplicate'], [7, 'duplicate']]}], ['regression: duplicate post detection, partial-repair probe', [['post', 'B', -40], ['post', 'B', 250], ['void', 'B', 'R1'], ['post', 'R1', 100], ['post', 'C', -40], ['void', 'R1', 'R3'], ['post', 'A', 250], ['void', 'R1', 'R1']], {'status': {'B': 'voided', 'R1': 'reversal', 'C': 'posted', 'A': 'posted'}, 'balance': 210, 'errors': [[1, 'duplicate'], [3, 'duplicate'], [5, 'not_voidable'], [7, 'not_voidable']]}], ['control 1', [['post', 'B', 250], ['post', 'C', 250], ['edit', 'A', 5], ['post', 'B', 250], ['post', 'B', 100]], {'status': {'B': 'posted', 'C': 'posted'}, 'balance': 500, 'errors': [[2, 'bad_command'], [3, 'duplicate'], [4, 'duplicate']]}], ['control 2', [['post', 'B', 250], ['void', 'D', 'R3'], ['post', 'D', -40], ['post', 'A', -40], ['void', 'R3', 'R1'], ['void', 'R2', 'R3'], ['post', 'R1', -40], ['void', 'B', 'R1']], {'status': {'B': 'posted', 'D': 'posted', 'A': 'posted', 'R1': 'posted'}, 'balance': 130, 'errors': [[1, 'unknown'], [4, 'unknown'], [5, 'unknown'], [7, 'duplicate']]}], ['control 3', [['post', 'R1', -40], ['post', 'B', 250], ['post', 'C', 250], ['void', 'R2', 'R3']], {'status': {'R1': 'posted', 'B': 'posted', 'C': 'posted'}, 'balance': 460, 'errors': [[3, 'unknown']]}], ['control 4', [['post', 'A', 999], ['void', 'R1', 'R3'], ['void', 'R2', 'R2'], ['post', 'R1', 999]], {'status': {'A': 'posted', 'R1': 'posted'}, 'balance': 1998, 'errors': [[1, 'unknown'], [2, 'unknown']]}], ['control 5', [['void', 'C', 'D'], ['void', 'D', 'R1'], ['void', 'R3', 'D'], ['post', 'A', -40], ['post', 'D', 999], ['post', 'C', -40], ['void', 'R1', 'R3']], {'status': {'A': 'posted', 'D': 'posted', 'C': 'posted'}, 'balance': 919, 'errors': [[0, 'unknown'], [1, 'unknown'], [2, 'unknown'], [6, 'unknown']]}]], [['regression: duplicate post detection', [['void', 'B', 'D'], ['post', 'C', -40], ['void', 'C', 'R2'], ['void', 'R3', 'R2'], ['post', 'R1', 100], ['post', 'C', -40], ['void', 'R2', 'D']], {'status': {'C': 'voided', 'R2': 'reversal', 'R1': 'posted'}, 'balance': 100, 'errors': [[0, 'unknown'], [3, 'unknown'], [5, 'duplicate'], [6, 'not_voidable']]}], ['regression: duplicate post detection, partial-repair probe', [['post', 'A', 999], ['void', 'A', 'R1'], ['post', 'R1', 999], ['post', 'D', 250], ['void', 'R2', 'R1'], ['post', 'B', 100], ['void', 'R1', 'R3']], {'status': {'A': 'voided', 'R1': 'reversal', 'D': 'posted', 'B': 'posted'}, 'balance': 350, 'errors': [[2, 'duplicate'], [4, 'unknown'], [6, 'not_voidable']]}], ['control 1', [['void', 'R1', 'R3'], ['void', 'A', 'R3'], ['void', 'R3', 'R1']], {'status': {}, 'balance': 0, 'errors': [[0, 'unknown'], [1, 'unknown'], [2, 'unknown']]}], ['control 2', [['void', 'C', 'R3'], ['void', 'R1', 'R3'], ['void', 'R2', 'R1'], ['void', 'R1', 'R1'], ['void', 'C', 'D'], ['void', 'A', 'R1'], ['post', 'D', 999]], {'status': {'D': 'posted'}, 'balance': 999, 'errors': [[0, 'unknown'], [1, 'unknown'], [2, 'unknown'], [3, 'unknown'], [4, 'unknown'], [5, 'unknown']]}], ['control 3', [['post', 'D', -40], ['void', 'R3', 'R1'], ['post', 'B', 100], ['post', 'R1', 250], ['void', 'C', 'D'], ['post', 'A', 999], ['void', 'R2', 'R2']], {'status': {'D': 'posted', 'B': 'posted', 'R1': 'posted', 'A': 'posted'}, 'balance': 1309, 'errors': [[1, 'unknown'], [4, 'unknown'], [6, 'unknown']]}], ['control 4', [['edit', 'A', 5], ['post', 'R1', -40], ['post', 'C', 100], ['post', 'C', 100], ['post', 'R1', 100], ['void', 'R2', 'D'], ['post', 'B', -40]], {'status': {'R1': 'posted', 'C': 'posted', 'B': 'posted'}, 'balance': 20, 'errors': [[0, 'bad_command'], [3, 'duplicate'], [4, 'duplicate'], [5, 'unknown']]}], ['control 5', [['void', 'R3', 'R1'], ['post', 'D', -40], ['void', 'R3', 'R1'], ['post', 'R1', 100], ['post', 'A', 250], ['void', 'R1', 'R3'], ['void', 'A', 'D'], ['void', 'R1', 'R1']], {'status': {'D': 'posted', 'R1': 'voided', 'A': 'posted', 'R3': 'reversal'}, 'balance': 210, 'errors': [[0, 'unknown'], [2, 'unknown'], [6, 'duplicate'], [7, 'not_voidable']]}]], [['regression: duplicate post detection', [['void', 'R3', 'R2'], ['post', 'R1', -40], ['post', 'D', 999], ['void', 'D', 'R2'], ['post', 'A', 999], ['post', 'D', 999]], {'status': {'R1': 'posted', 'D': 'voided', 'R2': 'reversal', 'A': 'posted'}, 'balance': 959, 'errors': [[0, 'unknown'], [5, 'duplicate']]}], ['regression: duplicate post detection, partial-repair probe', [['void', 'R2', 'R3'], ['post', 'B', 100], ['void', 'B', 'D'], ['void', 'R3', 'R3'], ['post', 'A', 100], ['post', 'D', 250]], {'status': {'B': 'voided', 'D': 'reversal', 'A': 'posted'}, 'balance': 100, 'errors': [[0, 'unknown'], [3, 'unknown'], [5, 'duplicate']]}], ['control 1', [['void', 'A', 'R1'], ['void', 'A', 'R1'], ['void', 'B', 'R3'], ['post', 'C', 100], ['post', 'B', -40], ['edit', 'A', 5], ['void', 'R2', 'D']], {'status': {'C': 'posted', 'B': 'posted'}, 'balance': 60, 'errors': [[0, 'unknown'], [1, 'unknown'], [2, 'unknown'], [5, 'bad_command'], [6, 'unknown']]}], ['control 2', [['void', 'D', 'R1'], ['post', 'D', -40], ['post', 'A', 100], ['void', 'A', 'R1'], ['void', 'A', 'R3']], {'status': {'D': 'posted', 'A': 'voided', 'R1': 'reversal'}, 'balance': -40, 'errors': [[0, 'unknown'], [4, 'not_voidable']]}], ['control 3', [['void', 'D', 'R2'], ['void', 'R3', 'R3'], ['post', 'B', 250], ['void', 'D', 'D'], ['post', 'C', 999], ['post', 'B', -40]], {'status': {'B': 'posted', 'C': 'posted'}, 'balance': 1249, 'errors': [[0, 'unknown'], [1, 'unknown'], [3, 'unknown'], [5, 'duplicate']]}], ['control 4', [['post', 'R1', -40], ['void', 'D', 'R1'], ['post', 'A', 250], ['void', 'R1', 'D']], {'status': {'R1': 'voided', 'A': 'posted', 'D': 'reversal'}, 'balance': 250, 'errors': [[1, 'unknown']]}], ['control 5', [['edit', 'A', 5], ['edit', 'A', 5], ['post', 'D', 100], ['post', 'B', 999]], {'status': {'D': 'posted', 'B': 'posted'}, 'balance': 1099, 'errors': [[0, 'bad_command'], [1, 'bad_command']]}]], [['regression: duplicate post detection', [['void', 'D', 'R3'], ['void', 'D', 'D'], ['edit', 'A', 5], ['post', 'B', 999], ['post', 'D', 250], ['void', 'B', 'R3'], ['post', 'R1', 999], ['post', 'B', 250]], {'status': {'B': 'voided', 'D': 'posted', 'R3': 'reversal', 'R1': 'posted'}, 'balance': 1249, 'errors': [[0, 'unknown'], [1, 'unknown'], [2, 'bad_command'], [7, 'duplicate']]}], ['regression: duplicate post detection, partial-repair probe', [['void', 'C', 'D'], ['post', 'B', 100], ['void', 'B', 'R1'], ['post', 'R1', 999], ['void', 'R3', 'D'], ['void', 'R2', 'R3'], ['void', 'B', 'R2'], ['void', 'R3', 'R1']], {'status': {'B': 'voided', 'R1': 'reversal'}, 'balance': 0, 'errors': [[0, 'unknown'], [3, 'duplicate'], [4, 'unknown'], [5, 'unknown'], [6, 'not_voidable'], [7, 'unknown']]}], ['control 1', [['void', 'R2', 'R1'], ['void', 'B', 'D'], ['post', 'C', 250]], {'status': {'C': 'posted'}, 'balance': 250, 'errors': [[0, 'unknown'], [1, 'unknown']]}], ['control 2', [['void', 'A', 'R1'], ['post', 'A', -40], ['post', 'A', -40], ['post', 'A', 999], ['void', 'R1', 'R2']], {'status': {'A': 'posted'}, 'balance': -40, 'errors': [[0, 'unknown'], [2, 'duplicate'], [3, 'duplicate'], [4, 'unknown']]}], ['control 3', [['post', 'B', 250], ['post', 'D', 100], ['post', 'A', 999], ['post', 'D', -40]], {'status': {'B': 'posted', 'D': 'posted', 'A': 'posted'}, 'balance': 1349, 'errors': [[3, 'duplicate']]}], ['control 4', [['void', 'C', 'R2'], ['void', 'B', 'R3'], ['void', 'R1', 'R2'], ['void', 'D', 'D'], ['void', 'R3', 'R2'], ['post', 'C', 250], ['post', 'A', 999], ['post', 'R1', 100]], {'status': {'C': 'posted', 'A': 'posted', 'R1': 'posted'}, 'balance': 1349, 'errors': [[0, 'unknown'], [1, 'unknown'], [2, 'unknown'], [3, 'unknown'], [4, 'unknown']]}], ['control 5', [['void', 'R1', 'R3'], ['post', 'C', 999], ['post', 'R1', -40], ['post', 'D', 999], ['post', 'A', 250], ['post', 'B', 250], ['void', 'R2', 'D']], {'status': {'C': 'posted', 'R1': 'posted', 'D': 'posted', 'A': 'posted', 'B': 'posted'}, 'balance': 2458, 'errors': [[0, 'unknown'], [6, 'unknown']]}]]]\nfor label, args, expected in fixtures[N-1]:\n    try:\n        actual = solve(args)\n    except Exception as exc:\n        actual = 'raised ' + type(exc).__name__\n    check(label, actual, expected)\nprint(json.dumps({\"observations\": observations, \"passed\": all(x[\"passed\"] for x in observations)}, ensure_ascii=False))\nraise SystemExit(0 if all(x[\"passed\"] for x in observations) else 1)\n"}},"limitations":"A deterministic bounded teaching model with stipulated toy bookkeeping rules stated in the contract; amounts are integer cents; it makes no claim of conformance to any accounting standard or product. This reproducer isolates one failure mechanism. Results cover the supplied fixtures. Variants within a family share a test contract and should remain grouped when constructing evaluation splits. Related mechanisms with a shared evaluation_group must also remain together; these controlled models are not independent production incidents.","method":"Deterministic executable model with adversarial boundary fixtures.","provenance":{"created_by":"Failure Map","dependencies":"Python standard library","family":"w2-double-entry-ledger-accounting-void-reversal-linkage-duplicate-post-detection","generated_at":"2026-09-29T14:46:24.525188+00:00","license":"CC0-1.0","python":"3.12.14","seed":1,"split":"open-access"},"relevance":"Ledger software must keep debits equal to credits and apply normal-balance, period and cutoff rules exactly; small sign or boundary slips silently misstate financial statements.","repair":"Refuse any post whose id exists with any status.","root_cause":"The duplicate check considers only posted entries.","sha256":"17ac96ded615307d97c2b502c4c366f4911bccf0efe4542ce7ac656f4ca957df","title":"Journal void and reversal linkage: duplicate post detection · case 01","variant":1,"variant_policy":"Five numbered records share a model and may reuse boundary fixtures.","verification":{"attempt":{"elapsed_ms":44.513,"exit_code":1,"observations":[{"actual":{"balance":1958,"errors":[[2,"unknown"],[6,"duplicate"]],"status":{"A":"posted","B":"voided","D":"posted","R1":"posted","R3":"reversal"}},"check":"regression: duplicate post detection","expected":{"balance":1958,"errors":[[2,"unknown"],[6,"duplicate"]],"status":{"A":"posted","B":"voided","D":"posted","R1":"posted","R3":"reversal"}},"passed":true},{"actual":{"balance":3057,"errors":[[2,"unknown"],[3,"unknown"]],"status":{"A":"posted","B":"posted","C":"posted","D":"voided","R1":"posted"}},"check":"regression: duplicate post detection, partial-repair probe","expected":{"balance":2098,"errors":[[2,"unknown"],[3,"unknown"],[5,"duplicate"]],"status":{"A":"posted","B":"posted","C":"posted","D":"voided","R1":"reversal"}},"passed":false},{"actual":{"balance":0,"errors":[[0,"bad_command"],[3,"unknown"]],"status":{"C":"voided","R2":"reversal"}},"check":"control 1","expected":{"balance":0,"errors":[[0,"bad_command"],[3,"unknown"]],"status":{"C":"voided","R2":"reversal"}},"passed":true},{"actual":{"balance":999,"errors":[[1,"duplicate"],[3,"bad_command"],[4,"duplicate"],[6,"duplicate"],[7,"not_voidable"]],"status":{"D":"posted","R1":"voided","R2":"reversal"}},"check":"control 2","expected":{"balance":999,"errors":[[1,"duplicate"],[3,"bad_command"],[4,"duplicate"],[6,"duplicate"],[7,"not_voidable"]],"status":{"D":"posted","R1":"voided","R2":"reversal"}},"passed":true},{"actual":{"balance":250,"errors":[[1,"bad_command"],[2,"bad_command"],[3,"unknown"]],"status":{"C":"posted"}},"check":"control 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