Overview

Amazon rolled out a new feed attribute named ShipFromSupplySourceId in early 2024 for its order‑fulfillment submissions. The field lets sellers pinpoint the exact warehouse, sortation center, or third‑party logistics partner that dispatched each order. Updating integrations to include this identifier is essential to avoid feed rejections and to keep inventory counts aligned with the correct fulfillment node.

Key Points

• Attribute introduction — ShipFromSupplySourceId is now a required element in both XML‑based and flat‑file order‑fulfillment feeds.
• Applicable feeds — The field is only relevant for the POST_ORDER_FULFILLMENT_DATA and POST_FLAT_FILE_FULFILLMENT_DATA endpoints.
• Supply‑source ID format — Sellers must supply the internal Amazon‑assigned identifier (for example, “AMZ‑WS‑001”) that corresponds to the location that shipped the order.
• Inventory reconciliation — Tagging each shipment with the correct source enables Amazon’s inventory engine to deduct stock from the right node, preventing oversell alerts and stock‑out mismatches.
• Error response — Omission of the attribute or use of an unregistered ID triggers a FeedProcessingError with the code InvalidSupplySourceId, causing the entire feed to fail.
• Automation impact — Systems that generate feeds automatically will need to pull the latest supply‑source list and map it to every fulfillment line before submission.

How ShipFromSupplySourceId Works

1. Retrieve the list of active supply sources — Call the GET /supplySources API to obtain every warehouse or 3PL ID linked to the seller account.

   • Example: A seller operating two fulfillment centers receives “AMZ‑WS‑001” for the East‑Coast hub and “AMZ‑WS‑002” for the West‑Coast hub.

2. — In the XML feed, add a element; in a flat‑file, populate the “ship‑from‑supply‑source‑id” column for every line item.