Unable to target transports or bunkers???

I have an ability based on charm and I can't take over a unit based on circle of power. The circle of power has Town Hall classification and the charm can target Enemy, Invulnerable, Non-Ancient, Structure (the non-ancient is necessary for game mechanics, I have some triggers that are supposed to add and remove the ancient classification from the circle of power type units). Those triggers seem to cause the ability to work sometimes but when the map is first started and the triggers haven't done anything, by default casting charm on the CoP's gives that weird message "Unable to target transports or bunkers."

What is that all about?

... Dunno maybe check Charm's field or it can't target Circle of Powers or check CoP fields.

-Av3n

Doh! I figured it out, I have another trigger that adds or removes the Cargo Hold ability to the Circle of Power type units to disable their attack. I read somewhere that that was the way to do it. I don't suppose adding and removing the actual attack ability works?

Dunno go ahead and try.

-Av3n

You can add and remove the actual CoP attack ability, yes.

You can? How?! With JASS or something?

I don't know if the GUI ability list has it (if it does, it should be Cargo Hold). Otherwise, it's 'Abun' (that's the orc burrow one anyway).

I think it appeared in the GUI list in one of the patches.

Using JASS you can remove the Move, Patrol, Hold Position, Stop, Attack and Attack Ground abilities from a unit. Check the trigger forums.