Code to refresh ALV display

FORM user_command USING ucomm LIKE sy-ucomm
selfield TYPE slis_selfield.
CASE ucomm.
WHEN '&IC1'.
IF selfield-sel_tab_field = '1-TRUCK_NO'.
SET PARAMETER ID 'ZTRUCK_NO' FIELD selfield-value.
CALL TRANSACTION 'ZNEW_TRUCK_MSTR'.

PERFORM GET_DATA. "Refresh internal table data
selfield-refresh = 'X'.
* selfield-exit = 'X'.
selfield-row_stable = 'X'.
selfield-col_stable = 'X'.

ENDIF.
ENDCASE.
ENDFORM. "user_command