If you use Teamlist to manage event registrations, you may have come across its Invoices report. This report can give you a quick indication about the money that has come in from registrants and any amounts waiting to be received.

Today I changed how the Owing column is calculated. Previously it showed zero wherever an invoice was cancelled. Now it shows billed minus paid, i.e. it will be a negative number if you need to refund some money. The Paid column will also be shaded purple, to make this situation visually obvious.

I also recently added the option to omit cancelled invoices from the report.