Use the Enter a Customer Payment/Refund/Gift Certificate routine to fix the error. Be sure to use the same payment type (for example, cash).
If making the correction on the same day the error occurred:
Enter the customer number then on the Order Deposits tab, enter or lookup the order number.
Enter a negative post for the difference in the deposit amount.
If making the correction on a day after the error occurred:
Back-date the negative post to the previous day. Note, however, that Blind Cash Balancing is always based on the system date (the day you actually post the correction). To see the correction based on the transaction date, use the Report Daily Receipts Register, in which you can run the report by transaction date instead of system date..