Overview

On February 2026 Amazon sellers may encounter catalog submission error 18102 when the product details they upload clash with information already stored in Amazon’s catalog. The mismatch blocks creation of new listings or updates to existing ones, forcing sellers to halt inventory uploads. Resolving the error quickly is essential to keep product launches on schedule and maintain sales velocity.

Key Points

• Root cause: data mismatch — The error appears when any attribute you submit (title, brand, model, UPC/EAN, etc.) does not closely match the corresponding values on the ASIN Amazon already holds.
• Multiple fields can trigger the block — Even a single‑character difference in a model number or a misplaced dash in a brand name can generate error 18102.
• Error message lists conflicting ASINs — Amazon returns the exact ASIN(s) that your feed conflicted with, giving you a concrete reference point for troubleshooting.
• Resolution hinges on side‑by‑side comparison — Sellers must open the listed ASINs, compare each attribute, and adjust their feed until the data aligns perfectly.
• Bulk uploads are most vulnerable — Large flat‑file submissions amplify the risk because a single typo can affect hundreds of rows, leading to mass rejections.
• Brand‑registry status reduces false positives — Sellers enrolled in Brand Registry see fewer mismatches when their brand name is consistently applied across listings.

How to Fix Error 18102

1. Read the full error output — Locate the error code in your feed response file; it will include one or more ASINs (e.g., “Conflict with ASIN B07XYZ1234”). For example, a CSV upload for a Bluetooth speaker might return error 18102 referencing ASIN B07XYZ1234.
2. Open the referenced ASIN on Amazon — Use the ASIN link to view the live product detail page. Note the exact title, brand field, model number, and any barcode identifiers displayed. In our speaker example, the title reads “Acme SoundWave Bluetooth Speaker – Black,” the brand is “Acme,” and the UPC is 123456789012.