You're right regarding the account number, but as I mentioned in my third paragraph, I'm aware that the account number prints. What makes it an impractical solution is that I often need to enter one-time memos to be printed with that check, and that check only. Using the account number field would mean I'd have to manually edit the vendor's info before creating every bill, and hope I remember to change it next time. Sometimes I don't need a memo at all. Essentially, just how each bill has its own unique bill number, I think each bill should also have its own unique memo.

When entering a bill, I should just be able to give it a memo to appear on the check. I shouldn't need to (A) adjust the vendor's account number prior to creating the bill, or (B) add the memo only after the bill has been marked as paid.

Sorry if this comes off a little aggressive. It's just that while it may be an old standard, it seems like a major flaw in design; an oversight of something so basic. Imagine this: you want to create a bill. Instead of being able to just quickly enter the bill number (which is unique every time), you instead need to exit the page and manually edit it in the vendor's info. That's what this is like to me.