The reason why you're getting this INVALID_MSKU_REMAP error when trying to add items to a shipment is that

  • There is already a different item in your inventory on Amazon seller central with an identical SKU
  • The SKU within your Amazon shipment is mapped / associated with a different ASIN


  • Check your Amazon seller central inventory and remove the SKU that is causing the conflict
  • Update / change the ASIN for the SKU within your Amazon shipment
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