Error 99109: Resolving Multiple Product Matches in Amazon Listing Feeds
Error 99109 blocks rows where a product‑id (e.g., UPC 123456789012) matches multiple ASINs (e.g., B01A2B3C4D, B01A2B3C5E, B01A2B3C6F). The feed stops processing only those rows until the seller adds the correct ASIN in the ASIN column and resubmits the file.
Overview
Error 99109 appears when a product identifier submitted in a bulk feed matches more than one catalog entry on Amazon. The system blocks the affected row until the seller pinpoints the exact ASIN that should be linked to the offer. Sellers who rely on flat‑file uploads or API feeds need to understand the cause and the step‑by‑step fix to keep listings active.
Key Points
- Multiple catalog matches — A UPC, EAN, or other external ID can correspond to several existing Amazon listings, leaving the platform unable to decide which product you intend to sell.
- ASIN specification required — Resolving the error demands that you locate the correct Amazon Standard Identification Number (ASIN) and insert it into the ASIN column of your feed.
- Row processing stops — Only the rows that trigger Error 99109 are held; all other rows in the same file continue to process normally.
- Common with bundles or variations — Shared barcodes are often used for multipacks, color‑size variations, or legacy catalog data, which increases the likelihood of duplicate matches.
- Error report lists candidate ASINs — Amazon returns a list of the matching ASINs in the feed error file, giving you a starting point for investigation.
- Timely resolution prevents sales loss — Each day a listing remains unprocessed can translate into missed inventory visibility and lost orders, especially during promotional periods.
How Error 99109 Occurs
- Feed submission — You upload a flat file containing a column for “product-id” (e.g., UPC 123456789012) and leave the “ASIN” column blank.
- Catalog lookup — Amazon’s matching engine searches its catalog for the supplied product‑id. In this example, the UPC is linked to three catalog entries: ASIN B01A2B3C4D (single unit), ASIN B01A2B3C5E (two‑pack), and ASIN B01A2B3C6F (color variant).
- Ambiguity detection — Because more than one ASIN shares the same identifier, the system cannot infer which version you are offering. It flags the row with Error 99109 and attaches the three possible ASINs to the error report.
Analysis & Recommendations
Why This Matters
Each day a row remains blocked the listing is invisible, leading to missed inventory visibility and potential orders—especially during promotional periods. Resolving Error 99109 restores the SKU to the catalog and prevents revenue gaps caused by delayed activation.
Key Takeaways
- Error 99109 occurs when a UPC/EAN maps to more than one catalog entry and Amazon returns a list of candidate ASINs in the error report.
- Only the rows flagged with Error 99109 are halted; all other rows in the same upload continue processing normally.
- Providing the exact ASIN (e.g., B01A2B3C5E for a four‑pack) in the ASIN column and resubmitting clears the block.
Recommended Actions
- →Open Seller Central > Inventory > Add Products via Upload > View Processing Report, locate rows with Error 99109 and note the candidate ASINs listed.
- →Search each candidate ASIN on Amazon, compare title, package quantity, and attributes, then edit the flat file to insert the correct ASIN in the AS...
- →Re‑upload the corrected file via Seller Central > Inventory > Add Products via Upload and run a preview validation to confirm the error is resolved.
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