Fetch with two form criteria

Fetch with two form criteria

Hi guys,
a fetch question are drive me crazy. I need fetch data in FormA with some criteria from both form (A and B). I try with list or variable without success. Anyone have a idea how develop it?
Thanks for any help.

Mike
  1. Stafflist = (FormA[((Day = input.Day && Staff = input.Staff) && Availability(FormA) <= input.Availibility(FormB)].ID).getall();
            Staff:ui.add(Stafflist);