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A late, short or mis-built shipment comes back weeks later as a smaller payment, with a deduction code where the explanation should be.
Disputing after the fact
Disputing one means assembling proof after the fact — dock times, the actual pick, what left on which trailer — from records nobody gathered for that purpose. The effort per dispute is the same whether the deduction is fifty dollars or five thousand, so the small ones are absorbed, and absorbing them is what makes the programme profitable for the retailer.
