What Is EDI 856 Advance Ship Notice? A Retail Overview

EDI 856 Advance Ship Notice The EDI transaction used to communicate advance shipment information and shipment hierarchy. An EDI 856—commonly called an Advance Ship Notice (ASN)—transmits structured, machine-readable details about a shipment before it arrives at a retailer, distribution center, or 3PL. The 856 tells the receiver what is coming, how it is packed, and how items are related within the shipment hierarchy (shipment → order → pack/pallet → carton → item).

At its core the 856 is about timing and structure. It provides shipment identifiers, carrier and transport details, estimated arrival times, packing structure (who shipped what in which unit), and per-line item quantities and identifiers such as UPC/GTIN or seller SKUs. Retailers use the 856 to prepare receiving windows, stage docks, plan labor, and automate receiving and putaway in their WMS.

What The 856 Typically Communicates

The 856 contains segments and hierarchical loops that map the physical packing and shipment relationships. Typical elements include shipment ID and date, carrier and trailer information, purchase order references, pallet/carton serial numbers (SSCCs), item identifiers (UPC/GTIN, SKU), quantities by pack level, weights and measures, and transport details (PRO/BOL numbers).

Why Retailers Use An ASN

Retail operations rely on accurate, timely ASNs to reduce manual checks and speed receiving. An accurate 856 allows a retailer to:

• Pre-Notify: Allocate dock space and labor based on expected arrival and pallet/carton counts.
• Automate Receiving: Match ASN data against purchase orders and barcodes to speed scanning and putaway.
• Enable Cross-Docking: Identify items that should bypass storage and flow directly to outbound shipments.

How The ASN Uses Hierarchical Structure

The 856 implements a hierarchical loop structure—commonly HL segments in X12—to describe parent/child relationships. That lets a sender state which cartons belong to which pallet, which pallet belongs to which shipment, and which items are inside which carton. This hierarchy is essential for retailers that use carton-level scanning or pallet-level SSCC tracking.

How It Differs From Other Documents

The 856 is not a bill of lading, invoice, or purchase order. It is a pre-arrival notice about the physical contents and packaging. A BOL/PRO provides legal carrier terms and movement details; invoices handle billing. The 856 complements those documents by providing packing and item-level data that the receiver needs before goods arrive.

Common Retail Data Elements

• Shipment ID: A unique identifier for the entire shipment (BSN segment in X12).
• SSCC/Carton IDs: Serial Shipping Container Codes for pallets and cartons to support scanning.
• Item Identifiers: UPC/GTIN or seller SKU with quantities per pack level.
• Carrier Info: Carrier name, SCAC code, PRO/BOL numbers for tracking.

Practical Example

A vendor ships three pallets to a retail DC. The vendor sends an 856 before departure with a BSN shipment number, three HL loops for pallets each containing SSCCs, carton-level HL loops for cartons on each pallet, and SLN/LIN/SN1 segments that list items and quantities per carton. The DC receives the ASN, stages dock labor for three pallets, scans SSCCs on arrival, and reconciles carton counts automatically against the ASN and PO.

Implementation Considerations For Retail

Retailers have specific rules about timing (how long before arrival an ASN must be sent), mandatory data elements (GTIN, SSCC, order reference), and format variants. Many retailers require an ASN hours or days before arrival, and they may issue chargebacks or exceptions for late or inaccurate ASNs. A robust EDI gateway, WMS integration, and clear trading partner rules reduce friction.

In short, the EDI 856 Advance Ship Notice is the structured pre-shipment message retailers and their suppliers rely on to communicate what is coming and how it is packaged. Accurate ASN content and hierarchy reduce manual receiving, speed throughput, and support advanced retail processes like cross-dock and carton-level inventory accuracy.