Steps to Enter PaymentsOnce a payment has been posted, it cannot be changed, and so additional payments must be entered to reverse the original payment and then enter a new payment with the correct information. To reverse a payment, enter the new payment exactly the same as the original entry except enter the amount as a negative number. Then enter the new payment with the correct information.
Tip: If applicable, after posting a negative payment, the negative payment automatically becomes an advance payment, and then when entering future payments for the particular customer, the advance payment will show similar to an unpaid invoice.