FA-60069 / Inventory cost layering / Member archive

First-expired-first-out lot picking: shelf-life reference date · case 04

Nearly expired lots are shipped because shelf life is compared against an absolute day number.

Member previewVariant 4 · 3 implementations · 7 checks per implementation

Case contract

Input {lots:[[lot,qty,expiry_day,unit_cost]], today, order_qty, min_shelf}. A lot is eligible when expiry_day - today >= min_shelf. Eligible lots are picked by earliest expiry, ties by lot id ascending. If eligible stock < order_qty return {"error":"insufficient","available":eligible qty}. Return {picks:[[lot,qty]], cost}.

Why this case matters

Inventory valuation and cost-of-goods decisions depend on this rule.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
insufficient	`{"cost": 99, "picks": [["B", 9]]}`	`{"available": 4, "error": "insufficient"}`	Failed

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