04. Settling the deposit with the guest
Once the real costs can be charged, the deposit paid by the guest on forehand should be settled with the costs to be paid.
01. Book deposit/advance payment reverse
To settle the deposit/advanced payment the guest already paid for, an extra has to be added to the reservation having the value in negative of the deposit/advanced payment that's already in the reservation.
This easily could be done in CICO as well on Check-out by adding the same extra for number = -1.
02. Deposit/advance payment in reverse on the bill
An extra should be available where the checkbox "Invoice adjustment extra" has been selected, as well as the checkbox "Allow customization of Name/Price during reservation:".
This extra should have a negative rate, based on the deposit. So if the deposit has a value of €200, the Invoice adjustment extra should have a value of -€200.