Payment Term Usefulness

I set up a Payment Term Template for Purchase Invoices. 1/3 due each of 30,60, 90 days. Due Dates based on days after Invoice Date. When I assign the Payment Term Template to a Purchase Invoice, I see correctly calculated amounts and due dates. When I look at Accounts Payable Summary and Age by Due Date, the entry shows in full and due. Same with Cash Flow report. I would expect the 3 payments to be aged by the calculated due date. Am I not setting up the Payment Terms correctly, or is this functionality not implemented?

Just bumping this post. An issue that is starting to affect planning and cash flow as my clients business grows.