Change class structure programmatically.

Hello all !

Something tricky I think, I recently tried to change the class structure of an ItemType programmatically, building the class_structure attribute this way :

<class id="xxx"> <class id="xxx" name="class1" /> <class id="xxx" name="class2" /></class>

Actually it did the job but I am facing some permissions issues when users want to set the classification on the objects, all the classifications are grayed out for some users whereas the "Can Add" is set to the appropriate identitiy without any class_path.

So my question, does Innovator need anything else to set a class structure ?

Thanks in advance !

Arnaud