Set terrain pathing on/off not working..

Greets all, I'm trying to turn off the pathing at a specific doodad and it won't turn the walkability off. This is the action in my map initialization trigger (events is "Map Initialization"):

Environment - Set terrain pathing at (Position of Long Natural Bridge

(Vertical) 1495 <gen>) of type Walkability to Off



When I test it out, I can walk all over it. Not only that, it's over a body of deep water. Am I forgetting to put something else in?|||well, maybe your order only change the terrain under the bridge, but the bridge has own pathing setting.