Close a billing cycle

I am trying to close a billing cycle and am recieving the following error message: has a balance discrepancy. Accounts Receivable indicates a balance of $15.88. The last closing balance indicates a balance of $3,236.10 as of

9/13/2006. The afore mentioned customer has a zero balance. The customer paid his bill in full and finance chgs. were assigned the same day. Finance charges were written off with an adjustment to customer balance. All of this occurred during the cycle we are trying to close. Any suggestions on how to get around this?