Getting Error: RIO Inventory Product External ID Auto Fill Set to Product Code, but no Product Code Detected for Current Product

If you have the Product Code option set for the Product Unique Identifier in the Configuration settings, this error will occur when you try to create a Product without a Product Code.

ERROR: RIO Inventory Product External ID Auto Fill Set to Product Code, but no Product Code 

If you want to use Product Code as the Product Unique Identifier, you will need to set a Product Code for every Product.