Level 1

How to apply a credit memo to an open customer invoice

I am on QB Premier 2015.  I created a customer credit memo by opening the original invoice, clicking on refund/credit which allowed me to edit the items on the original invoice to create my credit memo.  When I finished and saved the credit memo, it asked me if I wanted to apply the credit memo to an open invoice.  I said I did and it responded that that customer did not have an open invoice to apply the credit to.  The original invoice is still open and has a partial payment applied to it.  Is there another process to apply the credit memo to the open invoice balance? Should I create the credit memo another way?  The current customer balance is correct after creating the credit memo.