Yes, so SU3 setting may not work as it will be applicable to entire system for that user. You need to do some custom code here with offsets as I said.
data: date_low type char10.
data: date_high type char10.
data: lv_out type char80.
concatenate INPUT-LOW+6(2) INPUT-LOW+4(2) INPUT-LOW+0(4) into date_low separated by ':'.
concatenate INPUT-HIGH+6(2) INPUT-HIGH+4(2) INPUT-HIGH+0(4) into date_high separated by ':'.
concatenate 'Posting Period' INPUT-SIGN INPUT-OPTION date_low date_high into lv_out separated by space.
Now, LV_OUT will have required output.
Regards,
Naveen