Making the field : Plant for Mat. mandatory

Hi all,

I am trying to make the field PLANT FOR MAT. in the reference object screen mandatory.

In the IMG activity Define Screen Templates>>>Field Selection for Reference Object Screen I have changed the field as Required for a particular notification type.

But while creating the notification with the same notif type, it is not getting reflected.

Is there any other change required for doing this.?

Regards

Neeraj