How to make the avoidance from Detour Crowd Controller to ignore certain actors?

Hey there, i made an AI to control my units, and this AI uses the Avoidance feature. It works just fine, when moving my units they will avoid other units and stuff. The problem is, that i want certain actors (like Spells) to be ignored by this avoidance. There is a way to make the avoidance ignore certain actors? How do i do that?