This error occurs when you have associated a child SKU to multiple parent SKUs.
"Invalid variation relationship: The child variation is already assigned to a parent SKU. Please delete the old relationship before submitting a new relationship."
How to Solve and Prevent Error 8032:
If you upload an inventory file to your selling account where variations are created and wish to reassign your child SKUs to different parent SKUs, you must first submit a delete feed to break the variation family that was created during the initial upload. You will need to do this before assigning a new parent SKU to a child SKU.
Note: To submit a delete feed, enter “Delete” in the Update/Delete field in your data file for the SKUs for which you would like to reassign variation parent/child relationships and upload the template to Seller Central. Once the SKUs are deleted from your inventory, remove “Delete” from the Update/Delete field in your data file, update the relationship data as desired and upload the file containing the new relationship data to Seller Central.
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