I have been hampered with no multiple due dates for years, especially for my clients who bill tuition or membership dues. Generally, their customers can choose a payment plan of either 1, 2 or 12 payments.
Your solution is not very good for these clients, for the following reasons:
a) The statement is darn ugly
b) Applying cash can be a nightmare when the amounts don't agree.
c) Sometimes there are multiple invoices which must be split (fees, building fund, books, etc), and this can get even uglier.
d) Here's the big one - customers decide to change their payment plans in the middle. Can you imagine all of the credit notes and rebilling?
We really need a customization or a third party product here.
Steve Schwartz
PS - right now my clients live with the fact that they can't get a good aging out of the system.