This is happening because the product information in the spreadsheet doesn't match what you already have in the showroom. More specifically, one or more of these 3 identifying attributes has been modified:
- Style ID
- Option Code
Therefore Brandboom thinks you are trying to create a new product instead of updating an existing one.
Double check to make sure these attributes in the spreadsheet match what you have in your Showrooom. Chances are, there is some slight variation.
Delete the original products and import new ones. Or modify the correct product in the Brandboom interface.