Hi,
Say your comoensation wage type is XXXX and basic pay wage type is YYYY.
Then in the T539J you will maintain as like below
YYYY XXXX 27 %
Now when you will be maintain wage type XXXX is value in IT8 say like 20000 then wage type YYYY will be 5400 in the IT8.
The Basic Pay wage type YYYY maximum amount field will be as 96000 in the table V_T511.
Check and let me know.
Regards,
Sankarsan