Overview

Error 18009 is a feed processing error that Amazon sellers may encounter when submitting order-related data through Seller Central or feed-based integrations. This error indicates that the Order ID included in a feed submission could not be matched to any recognized order in Amazon's system. Understanding why this error occurs and how to resolve it can help sellers avoid delays in order processing and fulfillment.

Key Points / What Sellers Need to Know

• Invalid Order ID — Error 18009 is triggered when the Order ID provided in a feed does not match any existing order that Amazon has on record.
• Exact match required — The Order ID in your feed must exactly match a value you previously submitted in an order acknowledgment feed. Even a single mistyped character will cause a rejection.
• Common causes — Typical triggers include typos, transposed digits, using Amazon's Order ID instead of your own merchant Order ID, or referencing an order that was never properly acknowledged.
• Feed resubmission needed — Once you identify and correct the Order ID issue, you will need to resubmit the affected feed for processing.

Understanding the Error

When Amazon processes order-related feeds, it cross-references every Order ID against its internal database of previously acknowledged orders. Error 18009 means that cross-reference failed for one or more Order IDs in your submission. This can happen at various stages of the order lifecycle, including when submitting shipping confirmations, adjustments, or other post-acknowledgment feed updates. The error is essentially Amazon's way of saying it cannot find the order you are referring to, so it cannot process the associated data.

Common Causes

There are several reasons why Error 18009 may appear in your feed processing reports. The most straightforward cause is a typographical error, where one or more characters in the Order ID were transposed, omitted, or incorrectly entered. Another frequent cause is accidentally using Amazon's internal Order ID in a field that expects your own merchant-assigned Order ID, or vice versa. Additionally, if a previous order acknowledgment feed contained errors and failed to process correctly, the Order ID may never have been registered in Amazon's system in the first place. In that scenario, any subsequent feed referencing that order will fail because Amazon has no record of it ever being acknowledged.