Step 1: add below region of code

data: lc_alv TYPE REF TO cl_gui_alv_grid.

CALL FUNCTION ‘GET_GLOBALS_FROM_SLVC_FULLSCR’

IMPORTING

e_grid = lc_alv.

CALL METHOD lc_alv->check_changed_data.

Step 2:

here you can loop at ALV internal table and get new data