Diagnose and fix common causes of EDI 856 Advance Ship Notice rejections from a retail trading partner

Steps

1. Check for PO reference mismatches first: an 856 that references a purchase order not currently open in the retailer's system, or that isn't preceded by an accepted 855 PO acknowledgment, is a common rejection cause.
2. Validate shipped quantities against the acknowledged 855 amounts — shipping more than acknowledged can trigger over-receipt chargebacks, while shipping less without prior notice can trigger short-shipment chargebacks.
3. Audit the HL hierarchical loop structure (shipment > order > pack/carton > item) for correctness; items assigned to the wrong carton, cartons assigned to the wrong pallet, or missing hierarchy levels are a frequent structural cause of rejection.
4. Confirm required fields are populated correctly, especially the carrier SCAC code and ship-to location — blank or incorrect values in these fields are a recurring rejection cause.
5. Verify SSCC (serial shipping container code) values in the carton-marking segment match the physical carton labels, and that item quantities reconcile with actual carton contents.
6. Check transmission timing: sending an 856 after the physical shipment has already been delivered ('late ASN') is a common compliance violation flagged by many trading partners.