Code 13s are filed when the supplier invoices for one item number but Walmart received a different item number. This will always be caught if the item billed on the invoice is at a higher cost than the merchandise received – Walmart will file a code 13 for the difference.
Disputing Code 13s is extremely difficult, and it is rare to win a payback. Walmart says that they will not pay back for code 13s, but you can technically dispute them in the Accounts Payable Disputes Portal (APDP) in Retail Link.
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