Allow me to chime in, @edevries50.

When you update the product/services settings, a checkbox should appear: "Also update this account in historical transactions." If you don't see this message, then you might need to change the account, save the product/service, and then change it back to the correct one. I've included a screenshot below to show you where the message is:

You can also check out this article for more information: Change the account for a product/service item.

Feel free to comment below if you have any other questions or concerns. Take care!