Once again I am having an issue in QBO trying to apply an open credit memo to a partially paid invoice.  Wen I go to "Receive Payment" and select both the invoice and the credit memo, the "Amount Received" is not zero even though the credit offsets the balance due on the invoice.  If I save it this way, the invoice shows as paid, but the credit memo shows as unapplied.  What are the correct steps to apply a credit memo to a partially paid invoice?