Amazon error 8016: SKU already exists in your inventory under a different ASINThe SKU in item_sku is already mapped to another ASIN in your seller account. A SKU is a permanent pointer to one ASIN, so Amazon refuses to silently repoint it at a different product.How to fix error 8016

Run an 'All Listings' report and search for the SKU to see which ASIN it currently points at.

If the old listing is dead, delete it (Inventory Loader with add-delete = x) and wait for the deletion to process before re-adding the SKU.

If both products are real, give the new product a genuinely new SKU - SKUs are cheap, reuse is not worth the risk.

Never reuse a SKU that previously carried a different ASIN; historic reviews, FBA inventory and ad history follow the SKU.

All Amazon flat-file error codes