Hi Mujeeb,
This is due to missing functionality as the below coding:
LBAS0F2J
FUGR BAS0
FORM FCODE
...
PERFORM SET_USER_DATA_BUTTON.
WHEN 'OTHER'.
PERFORM OTHER_ASNUM.
PERFORM SWITCH_MODE.
...
You could comment off PERFORM SWITCH_MODE and retest it.
Regards, Gordon