In accounts receivable, it would be useful to see how credits have been applied to the account. I had a customer with a large credit available and each month I would apply the credit to open invoices and send him a statement showing the remaining credit on his account. Now he came in because he misplaced a bill from a month ago that showed the credit balance at the end of that billing period and being very particular about his accounting wanted a to see what that balance was on that statement and how credits were applied, but of course short of doing all the math and writing it in there is no way to reprint that statement or see what the balance was at that time.
I would be great to be able to pull up a previously created statement and to see how credits have been applied in the same way one can see how a payment has been applied.