Dynamic unused pad suppression doesn't work

Hello,

 I've a multilayer board (Orcad PCB Professional 17.2).

I checked the boxes in Cross Section Editor for Unused Pad (& Via) Suppression...I checked Dynamic unused pad suppression box (global flag)...but...on my pcb I see all pads in any inner layer.

Where's the mistake? Some "user parameter" to check?

Thank you

Stefano