FA-95053 / Warehouse slotting and bin packing / Member archive

FEFO putaway: mixed lot bin chosen by distance only · case 03

The receipt joins a nearby bin with a distant expiry while a bin with a matching expiry is available.

Member previewVariant 3 · 3 implementations · 8 checks per implementation

Case contract

bins [[bin, sku|None, lot, expiry_day, qty, capacity, distance]]; receipt [sku, lot, expiry_day, qty]. A bin is empty when sku is None or qty is 0. Preference: (1) non-empty bin with same sku and lot and room (capacity-qty >= receipt qty), nearest then id; (2) same sku, different lot, expiry within 30 days either way, room; smallest expiry gap, nearest, id; (3) empty bin with capacity >= qty, nearest then id; else "HOLD".

Why this case matters

FEFO storage keeps lots with similar expiry together so the earliest expiring stock ships first.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
generated mix 75	`"B2"`	`"B0"`	Failed

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