How to Fix Error 90003951 When Uploading Product Listings
Error 90003951 occurs when an optional field such as “Battery Type” conflicts with a required field like “Clothing Size” in a bulk upload, causing the entire feed to be rejected. Deleting the conflicting optional values and resubmitting clears the error. Use Amazon’s “Check Your File” validation tool before upload to catch such conflicts.
Overview
Sellers uploading bulk product data to Amazon sometimes encounter validation error 90003951, which blocks the feed from being processed. The error appears when an optional attribute’s value conflicts with a required attribute for the same SKU, forcing the submission to be rejected. Resolving the issue quickly is essential to keep large catalogs moving without unnecessary delays.
Key Points
- Conflict source — The error is raised when a non‑mandatory field contains data that Amazon’s rules deem incompatible with a specific mandatory field.
- Message format — Amazon’s response lists the optional attribute first, followed by the required attribute it clashes with, allowing you to pinpoint the exact column to edit.
- Simple fix — Deleting the value from the optional attribute identified in the message typically clears the error, after which the feed can be resubmitted.
- Data integrity — Only the conflicting optional field is cleared; all other product information remains untouched, so there is no risk of losing core listing data.
How the Error Happens
- Feed validation begins — Amazon’s ingestion engine reads each row of the uploaded flat file and checks every attribute against a category‑specific rule set. Example: a “Battery Type” column is examined for a product listed under “Clothing & Accessories.”
- Rule mismatch detected — The system finds that the optional attribute supplied (e.g., “Battery Type”) is not allowed when a mandatory attribute (e.g., “Clothing Size”) is present for that category.
- Error code generated — Amazon returns error 90003951, embedding the names of the two fields in the message: the first is the optional attribute, the second is the required attribute it conflicts with. Example message: “Battery Type conflicts with Clothing Size.”
- Submission halted — Because the validation fails, the entire feed is rejected, and none of the SKUs in that file are updated or created.
- Seller notified — The error appears in the feed processing report within Seller Central, prompting the seller to review the highlighted rows.
Analysis & Recommendations
Why This Matters
When error 90003951 appears, Amazon rejects the whole bulk feed, preventing any SKU updates and delaying product availability. This can stall inventory synchronization and cause lost sales, especially for large catalogs where manual correction would be time‑consuming.
Key Takeaways
- Error code 90003951 is raised when an optional attribute conflicts with a mandatory attribute for the same SKU.
- The error message lists the optional attribute first, e.g., “Battery Type conflicts with Clothing Size.”
- Clearing the value from the conflicting optional column resolves the issue without affecting other product data.
Recommended Actions
- →In Seller Central go to Inventory > Add Products via Upload > Upload your inventory file and open the original flat file.
- →Locate the optional column named in the error (e.g., Battery Type) and delete its values for the affected SKUs.
- →Save the file, run the “Check Your File” tool to verify, then re‑upload the corrected feed.
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