Modify application partition object (root) in ADLDS

I am not able to modify application partition (root object) in ADLDS instance.

In our directory we need one objectClass and its attributes in application partition (root) object.  When I try to add this objectClass (simple modify command) it is throwing an error (Code 65-ObjectClasss violation), the same class was added in old directory (Sun ONE Directory Server).

The require objectClass and its attributes are available in ADLDS schema. Here are modify operation: