Difficulty breaking hard constraint

[gui_desmarais@hotmail.com]

Hi guys, I'm having trouble breaking my hard constraint. I'm currently working on a metal destruction and upon impact my constraint doesn't break eventhough i give a treshold in which I want my constraint to break. I'm using a wrangle with: 

if (f@distance > ch("break_me")){
    removeprim(0,@primnum,0);
}

but my hard constraint stay together.

Thanks

[FlorianEggers]

Could you post your scenefile?

Maybe it's just something silly. Like, in your SOP solver, hooking up your code to the Geo input instead of relationships (?)