SOP counting till

I have an SA that wants to count her till in when she opens. I have no problem with it. She feels like if she's signing off on how much her starting bank is, she wants to verify that.

The issue is the SM doesn't want her counting her own till. Can I please get the SOP (and exactly how to find it, because man, I'm having trouble) of who is supposed to count on an SA's till?