So, these are the results:
Adding a global "TRIGGER ENTER" transition to the state "raycast" doesn't reach any result.
Generally, it seems that the TRIGGER ENTER system event doesn't works at all for this RTS. Strange behaviour, since in my RPG project I use it for a hundred triggers - activated by PLAYER with character controller (all it's WOW system) - and it works perfectly. Imhave to believe that it worsk ONLY with character controllers.
So, adding a rigidbody both to the routine radar and to the enemies, and sending a custom event and NOT the system one, everythin works fine.
Again, strange behavior...