Apply a Prepayment or Credit Memo against an Invoice If the customer issues a check for the amt of $400.00 to be applied to Invoice #100 and they also want to apply the OverPayment of $30.51 to Invoice #100.   Below shows that the system allows me to apply the overPayment to Invoice #100  (you simply have to double-click on the PrepayTest5 record first and then double-click on the invoice to get the values to apply properly) View the AR Receipt Detail Information  and the PPayTest5 of $30.51 is applied to Inv #100 properly along with the Check for the amount of $400.00 for a total applied of $430.51.  AR Aging updated correctly with Invoice #100 having a balance due of $1039.49.    The system works the same when applying a Credit Memo to an Invoice.   AR Aging displaying a Credit Memo # CM0000115 and Invoice #0000000103.  Customer wants to apply the Credit of $54.13 against Invoice #103, so they only send a check for the amount of $50.87.  Select the Credit Memo and the Invoice from the Check/Advice Detail Depress "Done" takes you to the next screen.  Here user may double click on the CM0000115 to apply the amount to the Invoice Then enter the amount Applied to Invoice   Save Record and both the Credit Memo #CM0000115 and Invoice #0000000103 have been cleared from the AR Aging  If user attempts to apply a deposit to a Credit Memo or Prepayment they will receive the following message: