Bulk returns are settled in accounting. Money goes missing in both directions.
Downstream. Retailers deduct from a supplier’s invoice for shortages, compliance failures, defects, and promotional terms. Industry analysis puts the revenue lost at 5–7% (SPS Commerce). Many deductions are shortage claims, a large share of them invalid. Few are disputed, because a dispute needs the return record, the entitlement, and proof of shipment and receipt.
Upstream. Supplier credits, takebacks, and stock-balancing returns have to be tied to the agreement that authorized them, or they go unclaimed. Parts distribution adds the core charge, a deposit released only when the old core comes back.
The fix is one record. Consignment, reason codes, entitlement, credit, and proof of receipt in one place. Then deductions get disputed with evidence, credits get claimed on time, and over-crediting gets caught before it posts.