To help you further:
Asume that you need to force user to fill 'Cost Center' field of the notification (type M4) which is in 'Location' Tab.
Ask your technical person to write the following code in the Include: ZXQQMU20 of user-exit QQMA0014.
code:![Capture.JPG]()
This prevents user from saving the notification without filling the Cost Center field of other tab.
You can write many such codes here as per your requirement.
Jogeswara Rao K