In the payload, one of id or stock_item must be given and the others must be omitted. Only specify id if editing an item that already exists in the creation event.

Only items specified in the payload will have their quantities changed. Items that were previously present in the creation event but not included in the payload will not change.

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Note

the lot_number and expiry_date fields here are unrelated to the similarly-named fields in the traceability module.