Overview

Error 99102 is a feed processing error that Amazon returns when a value submitted in a product listing feed does not match the corresponding value expected for another field. When this mismatch occurs, Amazon automatically corrects the conflicting value to a default, which can lead to unexpected listing data if sellers are not aware of the adjustment. Understanding this error is essential for sellers who manage inventory through flat files, feeds, or third-party integrations.

Key Points / What Sellers Need to Know

• Automatic Correction — When Amazon detects a mismatch between two related fields in your feed, it does not simply reject the submission. Instead, it overrides the conflicting value with what it considers the correct default, which may not reflect your intended listing data.

• Product ID Type Conflicts — The most common trigger for this error is a mismatch between the product identifier type (such as UPC, EAN, or ASIN) and the actual identifier value provided. For example, submitting an EAN-format number while specifying UPC as the identifier type will trigger this correction.

• Feed-Level Error — This error appears in feed processing reports, not on individual listing pages. Sellers who rely on bulk uploads or automated feed submissions need to actively monitor their feed processing reports to catch these issues.

• Silent Data Changes — Because Amazon applies a default value rather than rejecting the submission outright, sellers may not realize their listing data has been altered unless they review their processing reports carefully.

How This Error Occurs

Error 99102 is triggered during Amazon's feed validation process when the system cross-references related fields in a product submission and finds that the values do not logically correspond. The most frequent scenario involves product identifiers: a seller specifies one type of identifier in the product ID type field but provides a value formatted for a different identifier type. Amazon's system recognizes the discrepancy, flags it with error 99102, and substitutes the mismatched value with what it determines to be the appropriate default. This correction is logged in the feed processing report with a message indicating which field was changed and what the corrected value is. The error can also occur with other paired fields where Amazon expects consistency, such as category-specific attributes that must align with the selected product type.