What Is EDI 945?

The ANSI X12 warehouse shipping advice transaction sent by a warehouse or 3PL after shipment.

EDI 945 The ANSI X12 warehouse shipping advice transaction sent by a warehouse or 3PL after shipment. It is an electronic confirmation that goods have left the warehouse and provides shipment-level and often line-level details that downstream systems use for invoicing, inventory reconciliation, and carrier tracking.

As a post-shipment document, the 945 is typically generated by a warehouse management system (WMS) or a 3PL’s operational system once goods are loaded to a carrier. Unlike an advanced notice sent before or during loading, the 945 records what actually shipped — quantities, packaging details, carrier information, and any identifying marks or numbers used for freight handling.

What The Transaction Typically Covers

The EDI 945 contains structured data segments that describe the shipment at multiple levels. At minimum it usually includes shipment identifiers and dates, carrier and route details, pallet or carton counts, and item-level shipped quantities. Many implementations also include references to purchase orders, internal shipment numbers, and packing or serial numbers used for traceability.

• Shipment ID: A warehouse or carrier reference that uniquely identifies the shipment for reconciliation.
• Carrier Details: Carrier name, SCAC code, and often a PRO or tracking number.
• Packaging Counts: Pallets, cartons, or pieces shipped; pallet IDs when used.
• Item Lines: SKU, quantity shipped, and any serial or lot numbers if required.

Why It Matters

Receiving systems — ERP, retailer portals, and finance systems — rely on the 945 to match physical receipts against orders and advance notices. It closes the loop: inventory is decremented at the origin, carriers and receivers are given a definitive record of what was tendered, and billing or claims processes can reference a single electronic source of truth.

For 3PLs, timely and accurate 945 transmissions reduce disputes, speed invoicing, and improve KPI reporting. For shippers and receivers, the 945 supports inventory accuracy, exception detection (shortages, overages, damage), and audit trails required for compliance or customer SLAs.

How It Differs From Other Shipping Documents

The EDI 856 (ASN) and EDI 945 are often confused. The ASN is an advanced shipping notice — an outbound forecast sent before or during loading — while the 945 is a post-shipment confirmation of what actually left the dock. Packing lists and bills of lading still exist in paper or PDF form; the 945 is the structured EDI equivalent used for data exchange between systems.

Because the 945 is a confirmation, it carries the authoritative record for shipped quantities. If an ASN predicted 100 units and the 945 shows 95, receiving systems can trigger holds or exceptions for the five-unit shortfall and initiate claims or reallocation procedures.

How It Varies By Industry And Partner

Implementation specifics vary. Retail chains may require pallet-level detail and unique carton IDs; automotive or pharma shipments may require serial/lot and chain-of-custody fields. Carriers and trading partners often mandate custom segments or qualifiers to support billing (accessorials), special handling codes, or regulatory references.

Most warehouses map the core EDI 945 segments to internal WMS fields, but custom edits are common. Expect mapping work for references (PO vs. ASN ID), packaging hierarchies, and carrier-specific identifiers like PRO numbers or SCAC codes.

Practical Example

A typical 945 workflow: a shipper completes loading and confirms counts in the WMS; the WMS generates an EDI 945 containing shipment ID, carrier SCAC and PRO, pallet and carton counts, and line-level SKU quantities; the 3PL’s EDI gateway transmits the file to the buyer’s trading partner network; the buyer’s ERP uses the 945 to reconcile inventory and trigger accounts payable steps.

• Common Trigger: Loading complete / ship confirmation in the WMS.
• Downstream Action: Inventory decrement in ERP and invoice matching.
• Exception Example: 945 shows 3 cartons short — receiver places the PO on hold and opens a short-shipment ticket.

Tips For Accurate 945s

Accuracy starts with operational discipline: ensure physical counts are recorded at the dock, pallet/carton identifiers are scanned, and carrier details are recorded at tender. Automate generation from the WMS and use validation rules that check PO references, sum-of-lines vs. packaging counts, and mandatory carrier qualifiers.

Maintain a test environment with major trading partners to validate formats, and log transmissions for quick audits. For recurring mismatches, reconcile mapping logic and negotiate a standardized segment usage with partners to avoid custom fields that break during upgrades.

In short, the EDI 945 is the standardized electronic confirmation warehouses and 3PLs send after shipment to document what left the dock. Properly implemented, it reduces reconciliation friction, accelerates billing, and provides a reliable audit trail for physical shipments.