John, excuse-me for the misunderstood. I made some tests here and, with filters, the ad hoc query is functioning well. Did you try to execute the query with the filter WITHOUT the GRC-PC, to certify the query is OK? In my tests filter not work only when I made some mistake on definition of it (low/high. values)
Excuse-me if I am saying obvious things.
Best regards
Evanir Vieira.