ALV Editable Grid using the Function module

In ALV Editable Grid using the Function module, the Editable content is not Transferred to Internal table. To update the Internal table with Updated content Function modue GET_GLOBALS_FROM_SLVC_FULLSCR is useful. check the sample code  for how to use that Function in the ALV programs.
Sample code.
REPORT  zalv_edit.
TYPE-POOLS: slis.
DATA: x_fieldcat  TYPE slis_fieldcat_alv,
      it_fieldcat TYPE slis_t_fieldcat_alv.

data: BEGIN OF itab OCCURS 0,
        vbeln LIKE vbak-vbeln,
        posnr LIKE vbap-posnr,
        kwmeng LIKE vbap-kwmeng,
      END OF itab.
SELECT vbeln
       posnr
       kwmeng
  FROM vbap
  UP TO 20 ROWS
  INTO TABLE itab.

x_fieldcat-fieldname = 'VBELN'.
x_fieldcat-seltext_l = 'VBELN'.
x_fieldcat-hotspot = 'X'.
x_fieldcat-tabname = 'ITAB'.
x_fieldcat-col_pos = 1.
APPEND x_fieldcat TO it_fieldcat.
CLEAR x_fieldcat.
x_fieldcat-fieldname = 'POSNR'.
x_fieldcat-seltext_l = 'POSNR'.
x_fieldcat-tabname = 'ITAB'.
x_fieldcat-col_pos = 2.
APPEND x_fieldcat TO it_fieldcat.
CLEAR x_fieldcat.
x_fieldcat-fieldname = 'KWMENG'.
x_fieldcat-tabname = 'ITAB'.
x_fieldcat-col_pos = 3.
x_fieldcat-input = 'X'.
x_fieldcat-edit = 'X'.
APPEND x_fieldcat TO it_fieldcat.
CLEAR x_fieldcat.
CALL FUNCTION 'REUSE_ALV_GRID_DISPLAY'
  EXPORTING
    i_callback_program       = sy-repid
    i_callback_pf_status_set = 'STATUS'
    i_callback_user_command  = 'USER_COMMAND'
    it_fieldcat              = it_fieldcat
  TABLES
    t_outtab                 = itab
  EXCEPTIONS
    program_error            = 1
    OTHERS                   = 2.
IF sy-subrc NE 0.
  MESSAGE ID sy-msgid TYPE sy-msgty NUMBER sy-msgno
  WITH sy-msgv1 sy-msgv2 sy-msgv3 sy-msgv4.
ENDIF.

FORM status USING p_extab TYPE slis_t_extab.
  "Set the Button using the staus
  "Copy the Standard status from the program SAPLKKBL status
  " STANDARD using SE41, and use that here.
  "Pf status
  SET PF-STATUS 'STATUS' EXCLUDING p_extab.
ENDFORM. " STATUS
FORM user_command USING r_ucomm LIKE sy-ucomm
                        rs_selfield TYPE slis_selfield.
  DATA: gd_repid LIKE sy-repid,
        ref_grid TYPE REF TO cl_gui_alv_grid.
  IF ref_grid IS INITIAL.
    CALL FUNCTION 'GET_GLOBALS_FROM_SLVC_FULLSCR'
      IMPORTING
        e_grid = ref_grid.
  ENDIF.
  IF NOT ref_grid IS INITIAL.
    CALL METHOD ref_grid->check_changed_data .
  ENDIF.
  CASE r_ucomm.
    WHEN 'SAVE'.
      "Here you will get the data(along with modified rows/data)
      "Filter the modified rows and update to DB using BAPI/BDC
      "Accordingly
  ENDCASE.
  rs_selfield-refresh = 'X'.
ENDFORM. "USER_COMMAND