| X12 824 Application AdviceListed for Costco Merchandise US - Direct via IBM VAN (OLD) | application validation result original document reference, error location and response status | - Return an error for one line and associate it with that line rather than rejecting unrelated records.
- Keep application acceptance distinct from transport receipt and syntax acknowledgment.
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| X12 820 Payment Order Remittance AdviceListed for Costco Merchandise US - Direct via IBM VAN (OLD) | payment or remittance record payment reference, invoice references and amounts applied | - Allocate a partial payment across several invoices and preserve the remaining balances.
- Keep receipt of remittance information distinct from confirmation that funds settled.
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| X12 810 InvoiceListed for Costco Merchandise US - Direct via IBM VAN (OLD) | accounts-receivable or accounts-payable invoice invoice number, purchase order and invoice line | - Reconcile line amounts, allowances, charges and tax to the invoice total.
- Submit the same invoice twice and verify that it cannot create a second payable.
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| X12 850 Purchase OrderListed for Costco Merchandise US - Direct via IBM VAN (OLD) | purchase order or sales order buyer purchase order, order line and trading-party identifiers | - Map buyer item numbers to seller SKUs and explicitly convert case quantities to the agreed unit.
- Resend one purchase order and confirm that only one sales order is created.
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