ALV set_table_for_first_display

Hello Gurus,

Someone knows if these programming lines only Works with structures and tables in the dictionary ABAP, I have tried thousand times to use it with internal tables but it doesnt work. the example is BCALV_GRID_02

I don't have a solution for muy problema with internal tables.

    call method grid1->set_table_for_first_display
         exporting i_structure_name = 'SFLIGHT'
                   is_layout        = gs_layout
         changing  it_outtab        = gt_sflight.

Thanks