Mehga
This is easily possible with user-exit QQMA0014 . Function EXIT_SAPMIWO0_020 . Put the following code in the include ZXQQMU20 of the exit and the job is done.
e_viqmel-ausvn = '20160516'.
e_viqmel-ausbs = '20160517'.
These two lines update these fields at Notification Save event. It is tested and confirmed. The Malfn Start Date is updated as 16.05.2016 and the End Date as 17.05.2016.
Then, if you want to confine this code to a particular type of Notification say 'M2' then the code becomes
IF i_viqmel-qmart = 'M2'.
e_viqmel-ausvn = '20160516'.
e_viqmel-ausbs = '20160517'.
ENDIF.
Similarly if you want to update the Malfn time fields also then, you insert the lines for fields AUZTV and AUZTB also. You can do this with any Header fields of Notification.
Please revert in case of any clarification.
Regards
KJogeswaraRao