Hello Mutale
OIAL settings are of no use for this requirement because of the reason discussed several times..
You need to go for user-exit QQMA0014 wherein you need to put the following code in the include ZXQQMU20.
IF i_viqmel-qmart = 'M2'.
IF t_viqmur[] IS INITIAL.
MESSAGE: 'You need to fill ''Cause'' information in the Catalogs & codes tab.' TYPE 'E' DISPLAY LIKE 'I'.
ENDIF.
ENDIF.
When user tries to save the Notification without Cause values filled then the following error forces him to fill the Cause values.
Regards
KJogeswaraRao