Costco EDI
integration guide.

original purchase order, change revision and affected line

• Apply a quantity reduction to the existing order instead of creating another order.
• Test a cancellation arriving after allocation or shipment and route it to an exception owner.

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.

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.

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.

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.

shipment, order, package and item references

• Reconcile item quantities through shipment, order and packaging levels against the physical shipment.
• Test split shipments for one purchase order and prevent the second ASN from replacing the first.

original load reference, carrier and response

• Associate acceptance with the correct version of the load tender.
• Test a declined tender and ensure it returns to dispatch for reassignment.

shipment reference, event code, event time and location

• Deliver an older status after a newer one and retain event history without moving the current status backward.
• Send one milestone twice and avoid duplicate customer notifications.

carrier invoice, shipment reference and charge line

• Separate line-haul, fuel and accessorial charges before comparing the invoice with the agreed rate.
• Test a second invoice for the same shipment and distinguish a revision from a duplicate.

load reference, pickup and delivery stop identifiers

• Send an amended pickup appointment and retain the previous tender decision.
• Test a multi-stop load whose stop sequence differs from address sorting.

return authorization, original order and returned item

• Test a return quantity larger than the original shipment and require review.
• Keep authorization separate from physical receipt so stock is not increased early.

item, location, quantity type and snapshot time

• Distinguish on-hand, available and reserved quantities before publishing availability.
• Deliver an old snapshot after a new one and prevent stale stock from replacing current values.