I run a rental business and utilize two primary classes - Projects and Rental Operations - which in turn have a number of subclasses to reflect major capital projects in the former and regular rental operations in the latter.

When I run a cash flow report, I tried to use filters -> class -> Select Multiple to select Rental Operations with all of its subclasses. The problem I am having is that this report give me an inaccurate A/R number. The report includes all rental invoices, each of which is tagged with a class, but none of the payments, which apparently do not have a class tag. So the report essentially shows all my invoices as unpaid.

Any idea how to fix this so that the rental payments are included in this report with this filter on?