Pallets.
A pallet is a logistic unit with an SSCC. Aggregation events bind the cases on it; a later disaggregation records the split. Append-only storage keeps both, so the unit's history is the sequence of events, not a mutable current state.
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Build state, 29 July 2026. The capture gateway is written and passing its conformance tests; nothing is hosted yet. See What for the dimension, and What ships today for the dated ledger.