This error means that you are attempting to change the SKU’s identity. The product data you have submitted has changed. Your product is going to be associated with a different product in the Amazon catalog (based on its ASIN) if this data is processed.
You can solve this issue with the “Delete, Delay & Recreate” action from StoreAutomator.
Here are the steps you need to follow:
1- Select the affected product and go to “ Three dot icon>Advanced Sync Options>Delete, Delay & Recreate”.
2- Sync the channel.