Correcting credits applied as payments that are appearing in customer statements

Last fiscal year we had set up a new item that was for the purposes of issuing credits to customers.  The item was setup incorrectly as a Payment that went against an Other Current Asset account.  After year end we discovered that there was an issue with these credits and corrected them through JE's- except now when we generate a customer statement, there is a credit balance showing in the Amount Due field, although there are no open items and nothing in the aging balances.  Looking to address the credit memo issues without changes to the prior year but have not been able to find any work arounds other than to create new customer accounts and not use the old, incorrect ones.