Products&services using a debtor code

Hi, I am setting up our QBO and I have set up a product&service with a debtor account entered as the income account, this is how we have had it set up in QBD. However, when I enter an invoice using this product/service it defaults to the Uncategorized Income account. This is incorrect for me. Why is it doing this? How can I make it go to the debtor account I want?