help with heros and the alter

When i make an alter(changed building) with a custom hero in it(new model and everything) you can make the hero and revive him, but it lets you make more than 1! How can i make it so you can only make 1 of thhe same hero. plz help

Edit: the model is based off the paladin

Melee - Enforce melee hero limits.

I think that's what the trigger's named.. have it run when the map Initializes. That way the altar should only allow you to build one of each available hero, up to the customary limit of three different ones.

but i do have that trigger and it still lets me :(

Still researching a global way. Current method is to use lots of triggers, very cumbersome, to do every little step.