The EDI 856 — the Advance Ship Notice — is the most demanding document in retail EDI, and the most expensive to get wrong. It's a carton-level mirror of your physical shipment that must arrive before the freight does. Retailer receiving docks plan labor around it, scan against it, and deduct against it.
The HL hierarchy: pack it how you say you packed it
What makes the 856 hard is the HL loop — a nested hierarchy describing the shipment:
- Shipment — the truck: carrier, bill of lading, total weight.
- Order — each PO being fulfilled (the PRF segment ties back to the 850).
- Pack — each carton or pallet, identified by an SSCC-18 in the MAN segment.
- Item — what's inside each pack, with quantities in SN1.
The hierarchy must match physical reality. If carton 42 contains 12 units of one SKU and 6 of another, the ASN must say exactly that under exactly that carton's SSCC-18. Walmart rejects order-level-only ASNs. Best Buy scans UCC-128 serials at the DC and deducts on label/ASN mismatches. Target wants the shipment→order→pack→item structure exactly as physically packed — its receiving process depends on it.
Timing is a compliance rule
Every major retailer times the ASN. The common standard: transmit at truck departure, and always before arrival at the DC. Walmart counts a late ASN as an OTIF miss even when the freight itself is on time. Grocery DCs tie the ASN to the delivery appointment. The pattern is universal — a dock that knows what's coming turns trucks faster, and retailers bill you for breaking that.
This is why the ASN can't be an end-of-day batch job. The trigger should be your warehouse's ship confirmation: freight confirmed, ASN generated, validated, transmitted — minutes, not hours.
Where 856s go wrong
Three failure patterns cover nearly every ASN deduction:
- Label/document mismatch. The SSCC-18 on the physical label doesn't match the MAN segment, usually because labels and ASN are generated by different systems. Fix: one source of truth for carton data.
- Hierarchy shortcuts. Order-level ASNs, missing pack levels, items not nested under their actual cartons. Fix: build the ASN from actual pick-and-pack data, not from the PO.
- Silent shorts. Shipping less than ordered without reflecting it in SN1. The dock counts, the system compares, the deduction files itself. Fix: the ASN reports what shipped, not what was ordered.
A 997 acknowledgment confirms the retailer received your ASN — but receipt is not compliance. Syntax can pass while the content earns a deduction.
Automating it
EDISQ generates the 856 from your fulfillment data — from your ERP's shipment record or your 3PL's 945 confirmation — maps it to each retailer's specific hierarchy rules, validates SSCC-18s against label data, and transmits on the ship-confirm trigger. Each retailer's quirks live in the certified map: the partner directory shows exactly what each one enforces.
Pricing follows the same ladder as everything else: first 25 documents monthly free, then from $0.50 per document. A 400-carton ASN is still one document.
If the 856 is your entry point to EDI — it usually is, since it's the document retailers certify hardest — read your specific retailer's requirements first. The difference between Walmart's and Target's ASN rules is exactly the kind of detail that separates a clean scorecard from a deduction column.
FAQ
What does ASN stand for?
Advance Ship Notice — the EDI 856. It tells the retailer exactly what is on the truck, how it's packed, and which cartons carry which items, before the freight arrives.
When must the 856 be sent?
Before the freight arrives — most retailers say at truck departure. Walmart treats a late ASN as an OTIF miss; Target deducts for ASN inaccuracy. Timing is a compliance rule, not a courtesy.
What is an SSCC-18?
An 18-digit serial number identifying one carton or pallet, printed as a GS1-128 barcode on the label and transmitted in the ASN's MAN segment. Receiving scans the label and matches it against the ASN — mismatches become deductions.
What does sending 856s cost with EDISQ?
Per document only: first 25/month free, then from $0.50, decreasing with volume. One ASN is one document, regardless of how many cartons it describes.