About ACO : Appointments (write,wsome optional)

Hi !
I’ve created a custom ARO group “External Dr”, they access his own calendar ok, open encounter ok.

Front Office clerk must fulfill provider’s ‘At-Office’ events so they know when to arrive, BUT those External Dr ARO group is granted to DELETE those events, and I dont wanna let them do it.
They must read own calendar event BUT not delete those events, is that possible?

I’ve seen that ACO : Appointments (write,wsome optional), rule about access to calendar, but granting that delete action.

Any comment/advice ?