When a bill is returned to us and we want to indicate that it has been returned, we must access Invoicing > Invoice Receipts, inside the Receipt click on Edit and uncheck the box "Remitted".
If we want to indicate that the receipt was returned or any other information, we can record it in Concept field of the same receipt.
.Bear in mind that if the receipt was already Collected, we must uncheck the collection of the receipt.
Your receipt is released so you can remit it again whenever you want!