Hello Susan:
There is no composite table that would do that. The alternative would be to have 2 linked Views. One would be AR Invoices showing the Original and Current amounts. The 2nd would be the Invoice and Credit Note details. When you select a specific AR invoice, it would look up and the display the details in the linked View.
This works well for on-screen inquiries. If you are interested in a printed report, you could do this with Crystal Reports.