The Cash Receipts function allows you to process additional payments for a closed reservation.
This new functionality allows you to send an invoice through to Financial Integration.
This has been introduced to stop users from re-opening bookings which have already been sent to Financial Integration after it was closed.
A closed reservation is one that has a balance of $0 and has been marked closed from the reservation payments page.
The Cash Receipts function is commonly used where an additional charge such as a traffic infringement/toll charge etc, has been received after the reservation is closed.