Credit Card Payment Adjustment

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I am hoping someone can assist with this:

In a previous month, my office processed a credit card payment credit for a customer the month after the payment was received.  They did not void the payment in Business Works and that month was already reconciled.  Therefore, I am off by that amount when reconciling my account for the month the credit was given.    Also, the customer, has just paid the invoice via credit card, but we can not post that payment to their invoice, as our system thinks it is already paid. I know I can not void the original payment because that month has been reconciled.  How can I correct this? Or is my best option to let that month be off and it will work out when the new payment appears on our bank statement but wasn't put in Business Works?

Thanks so much,

Jill