Open Credit on Credit Card vendor

Hello,

My boss recently overpaid on the balance of the business credit card and I ended up putting the remainder into open credits so that our bank statement would balance. When I applied some of the open credit to an invoice, the next time Payroll printed checks, it printed a zero amount check with the employee checks and she had to reprint.

What I want to do is get rid of this open credit that was posted via Checks>Enter Payments. That way it won't mess up payroll again. Could I get this out of open credits by entering a debit memo? I would then do a negative invoice for the credit on the statement so that I will balance later. I'm not sure if that will work since the open credit was not coded to anything, but the debit memo will have to be coded to something.