I asked for this feature over ten years ago now and was told it would probably be in a forthcoming release way back then. I've asked for it twice more since then. I cannot believe this feature, which is standard on every accounting package I've ever used or known, is still absent from Quickbooks Mac. My biggest client requires PO numbers on all accounting correspondence (which is not uncommon for large organizations). When I send them statements, I have to generate them by hand in a spreadsheet, so I can include invoice POs.

Ten years ago, my new accountant & bookkeeper requested that I switch to Quickbooks from Account Edge. I begrudgingly obliged. It wasn't until after the transition was complete that I discovered this major omission. C'mon Intuit! I'm a coder, and I know how minor this is to code. Just add one more field to the statement line items.