Thank you for your reply, but I don't believe you understood my question.

I had no problem creating (and using) the custom report. I have been using several different ones for months.

The issue with the filter not applying correctly (i.e. - I filter on Invoices but estimates and payments show up as well) only began after I created a custom Invoice form.  And it isn't just an issue on my custom reports, it affects the standard ones as well.

I appreciate your information, but it doesn't help with my question.