Code 30s are triggered when two invoices are submitted for the same goods/purchase order.
A common scenario for receiving code 30s is when an invoice is sent for an order before Walmart receives the order. If this happens, Walmart will issue a code 25 for no merchandise received and then close out the order. If another invoice is sent for that order once Walmart receives the order, then Walmart will issue a code 30 for a duplicate invoice.
Yes. Code 30s can be disputed and won if you can prove that each invoice was for a unique order.
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