Stopping AI

I have this problem.
I have some computer-controlled players in the game, which, when ordered to attack-move an enemy are automatically using their spells.
Now i don't want this to happen, so how can i prevent it?

You have to base the spells on an ability that doesn't have an internal AI assigned (e.g. Channel). For many abilities, this may be impossible.

or you can remake your units on units that dont have any spells so that won't happen