So obviously SotAM is blocked by Parma. However, my question becomes, can it fact detect an active Parma, even if it lacks sufficient penetration? My thought on the matter was yes, you'd probably get a 'reading' in line with a ReVi effect, but nothing else, as you failed to penetrate. Curious as to what everyone else thinks though.
The same question could actually be asked of an Aegis too.
I'd say no, it can't detect an active Parma; it can only "detect" it's not revealing anything.
The rationale is that magic that targets the Parma must, in general, penetrate the Parma.