Solaris 10 rbac: works fine but not for fdisk

I edit prof_attr Altro-prof:RO::\ Altro prof: I assign some commands for "altro-prof" vim exec_attr Altro-prof:solaris:cmd:RO::/usr/sbin/prtvtoc:uid=0 Altro-prof:solaris:cmd:RO::/usr/sbin/fdisk:euid=0,privs=all I assign the profile "Altro-prof" to a user with usermod -P The command prtvtoc works fine, the command fdisk return this pfexec -P all fdisk /dev/rdsk/c0t2d0p0 fdisk: Cannot open device /dev/rdsk/c0t2d0p0 Why? The user has the profile assigned profiles Comandi-root Altro-prof Basic Solaris User All