I am still trying to wrap my brain around the mechanics of using Boolean. I enter a transaction in the parent table. Based on the Vendor ID, the open-transactions (unmatched) will populate the portal. Then the user ticks the matched field to select it, to apply to the Remaining Balance. I think it is confusing to the User to see a "1" instead of "Yes".
Matched is defined as a Number Field. I have formatted it as Boolean (see second screen print).