Sign up now for a 60 day free trial. No credit card required.
Sign up now and it's free until June!
This can happen if the booking was cancelled after the invoice had already been sent. It could also happen where a group did not meet one week of a repeated booking, but you forgot to remove the booking before sending the invoice.
Resolving this issue, is very easy:
3, Enter the credit into the Add Invoice Line dialog with your own description. Enter the amount as a negative number.