problem with idprop in pyconstraint

Hi, when i create 2 objects that use the same pyconstraint script i don’t know why they use the same idprop (they have the same instance)
This its really inconvenient because if you create 2 objects with the same pyconstraint they need to have the same settings(you have no choice)

I get this when i append to a scene two instances of the same group
If i change the name of the constraint i think they act different, but i have a lot of this constraints
Somebody know something about this?