Equipment Master: Class Field Mandatory

Dear All

I am getting a problem during Equipment Master Creation in IE01. If i am trying to save the equipment without entering details in classification view, system is giving error message " Please enter Class".

Is there anywhere in the configuration we can make the class field mandatory?

I have checked in OIAD & OIAF, in both places i am finding the class field. In anyother place i need to check for field selection?

Please guide me to solve this problem.

Thanks & Regards

Bala