Understanding Error 100640: Resolving ASIN Conflicts Between Amazon Regional Stores
Error 100640 occurs when an ASIN designated for an Amazon regional store is also used on Amazon.com. Sellers must delete the conflicting Amazon.com offer and create a separate ASIN if they want to sell on both marketplaces.
Overview
Error 100640 is a listing error that Amazon sellers encounter when attempting to create or manage an offer on Amazon.com for an ASIN that is already designated for use in another Amazon regional store. This conflict arises because Amazon requires separate ASINs and SKUs for certain products across its different marketplaces, and sellers must understand which store an ASIN belongs to before creating offers.
Key Points / What Sellers Need to Know
- Dual store listings are not permitted — Certain ASINs are designated for a specific Amazon regional store and cannot simultaneously support offers on Amazon.com, triggering this error if you attempt to list on both.
- Your regional store offer is unaffected — If you receive this error, your existing offer on the designated regional Amazon store remains active and is not impacted by the conflict.
- Separate ASINs are required — Amazon's policy mandates that some products maintain separate ASINs and SKUs between regional stores (such as the North America Remote Fulfillment program stores) and Amazon.com.
- Routine validation can trigger this error — Even if you did not recently create a listing, Amazon's system may detect the conflict during periodic inventory validation checks.
- Resolution requires removing the conflicting offer — The Amazon.com offer must be deleted to clear the error, as the ASIN is reserved for the other regional store.
What Causes Error 100640
This error can be triggered by several scenarios. Most commonly, a seller attempts to create a new offer on Amazon.com using an ASIN that is already active in another Amazon regional marketplace. This can also occur when an existing Amazon.com offer remains on a seller's account for an ASIN that has been migrated or redesignated to another Amazon store as part of marketplace restructuring. Sellers who try to update or modify an Amazon.com listing for an ASIN that has been marked for exclusive use in a regional store will also encounter this error. Additionally, Amazon's automated systems may flag the conflict during routine validation checks if they detect overlapping inventory between Amazon.com and the regional store for the same ASIN.
Analysis & Recommendations
Why This Matters
Sellers expanding across Amazon's regional marketplaces need to understand ASIN separation rules. This error can block Amazon.com listings and requires creating new ASINs, which impacts product launch strategy across stores.
Key Takeaways
- Certain ASINs are designated for specific Amazon regional stores and cannot be listed on Amazon.com simultaneously
- Your existing regional store offer remains unaffected when this error occurs
- Selling the same product on both Amazon.com and a regional store requires creating separate ASINs and SKUs
- Always verify which marketplace an ASIN is designated for before creating new offers
Recommended Actions
- →Delete the conflicting Amazon.com offer immediately to resolve the error
- →Create a new, separate ASIN for Amazon.com if you want to sell the product on both marketplaces
- →Audit your multi-marketplace catalog to ensure no ASINs are inadvertently shared between stores that require separation
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