When sending out invoices we have to manually choose a billing contact that is different from the primary contact on an account. This is a huge pain and often invoices go to the wrong person. There should be a way to choose a default accounts payable contact that may or may not be the primary contact. This has caused us quite a problem. If you are only invoicing a few accounts no big deal; but if you are billing hundreds at a time, it is an extra step that costs time and money. It would probably be a simple fix to add this option.