Why MPSE Applet does not have option to add Classification attribute Values. when it does allow classification of the Part but does not let you add classification attribute values.?

I am using Windchill 10.2 M030 and i came across a situation where in when i am creating a new part from MPSE i am able to Classify the part but the next option to add classificaiton attribute values does not come up, which is really strange. Is there any reason why user is not allowed to add classification attribute values when a new Part is created from MPSE.