Creating a Report - Payment by Invoice and Credit Memos

There is a report under Customer/Receivables titled AR Payment history by Payment.  I am trying to customize this (or create a new report from scratch) that will include Credit memos used in this payment.  Right now when you run this report, it shows the payment date, check number, customer, method, amount and the invoices the payment was applied to.  But it does not show any credit memos that might have been applied with this payment.  Is there a way to customize this report or a new report to create?  All the info is there in NS, so there must be