Hi,
In AP Payment Entry when you do “Actions” - “Select Invoices” it brings up the “select invoice” popup, if you click OK there it then brings up the “Invoice payment Selection” list. I have copied and customized this Invoice payment Selection popup but I cannot find how I put it live so it gets called, I cannot find it in the menus and doesn’t look like I do it in Process calling maintenance.
The trick is the create a customisation on the base AP Payment Entry form with EXACTLY the same name as the one you’ve created on the select invoices screen.
You don’t need to actually change anything on the base form, but create that customisation and then link the Menu IDs that call AP Payment Entry to this new customization.