The existing invoice app shows total balance due for a customer when you select Contacts.
The new MYOB assist app does NOT show total balance due for a customer when you select Contacts.
Please don't retire the invoice app before you have updated MYOB assist app to show total balance due for a customer. It would be even more useful if the app could show the amounts due in the different aged periods, current, 30, 60 and 90+ days = total.