Destructible meshes help

Hi. Iv been playing arount with destructible meshes generated by the engine itself. but im unable to make my proyectile make the wall break.

I can break the wall when i go trought and all works fine but when i throw a proyectile against the break wont trigger.
iv checked all the posible default physical options so its probably something i should add on event hit but for now im unable to find the node to trigger that on the hitted actor

http://i1380.photobucket.com/albums/ah198/Krzysztof_Kantoch/breakeable_zpstkkzhprp.jpg

Thx in advance

Did you looked at the content example (Accessible from the launcher Learn tab)?