I appreciate the help, but I have done all that. 

The change must come from a higher level than the error!  What needs to happen is one of 2 things: (1) for there to be NO default income account for a new Product, so the creator MUST choose the correct income account, OR (2) the user needs to be able to SET a default income account for a new Product, so it doesn't have to be added every time. 

Making corrections all the time after an employee has incorrectly added a product & created invoices with it is unacceptable.