Cancel Part Relationship

Hi Experts,

I have activated the BADI PPE_MENU_PARTPROG, and set the the cancel part relationship. But when i go to a node and set the classification with class type, class name i am not able to assign the new NODE that will replace the existing node in CCM checks. your expert advise will be appreciated.

In short how the cancel part relationship work in iPPE.

Thanks,

Amit