Overview

Error 8684 occurs when a single SKU in your Amazon catalog becomes associated with more than one GCID (Global Catalog Identifier) or ASIN. This creates a conflict in Amazon's catalog system because each SKU must map to exactly one product listing. Understanding how to diagnose and resolve this error is essential for sellers who manage large catalogs or frequently submit product feeds.

Key Points / What Sellers Need to Know

• One SKU, One ASIN Rule — Amazon enforces a strict one-to-one relationship between SKUs and ASINs. If a SKU becomes linked to multiple catalog entries, the system will reject submissions with Error 8684.
• GCID Conflicts Trigger the Error — The error specifically flags that your SKU is tied to more than one GCID, which Amazon does not permit. This typically happens when duplicate catalog entries exist under similar attribute values.
• Feed Deletion May Be Required — In many cases, resolving the error means submitting a delete feed for the problematic SKU and any related SKUs that share the same attribute values, then resubmitting clean data.
• Duplicate Detection — Amazon checks whether a submitted SKU is duplicating an existing catalog entry using the GCID. If a match is found against multiple records, the submission fails.

What Causes Error 8684

This error is rooted in catalog conflicts. When you submit a product feed, Amazon attempts to match your SKU to an existing ASIN using identifiers like the GCID and the merchant_suggested_asin attribute. If the system finds that your SKU has been previously submitted and is now tied to more than one ASIN — whether through separate feed submissions, listing tool errors, or manual catalog edits — it raises Error 8684 and blocks the submission. The conflict can also arise when multiple SKUs share the same attribute values, causing Amazon's matching algorithm to create unintended associations across catalog entries.

How to Resolve the Error

There are two primary approaches depending on your situation.

Option 1: New Submission with a Unique SKU. If the SKU you are submitting needs to create a brand-new ASIN, first assign it a unique SKU value that is not already in your catalog. If you want to keep the same SKU, you will need to submit a delete feed to remove the previously submitted SKUs that are causing the conflict, and then resubmit your product data with clean associations. This clears the duplicate GCID linkage and allows Amazon to process the new listing correctly.