not getting data from driver program passing through internal table

Hi ,

I am not getting data from driver program passing through internal table in sapscript main window.

here is below code..

Loop at itab .

CALL FUNCTION 'WRITE_FORM'

EXPORTING

ELEMENT = 'RSLIP'

FUNCTION = 'SET'

TYPE = 'BODY'

WINDOW = 'MAIN'

endloop.

Regards.