Screen Field Value Should be changed based on changes in ALV values

Hi All,
We had created a ALV with container, in this Alv we have a checkbox, which is editable.
Based on the selection on checkbox , we need to update a field "Total selected" on screen.
we are using Event to handle data changed in ALV, but some how it doesn't work.
we even tried to use 'DYNP_VALUES_UPDATE' Function module to Update the field.
Please find the code below.
LOOP AT gt_final INTO gw_final WHERE mark EQ 'X'.
          gv_sel = gv_sel + 1.
ENDLOOP.
        lw_dynpfields-fieldname = 'GV_SEL'.
        lw_dynpfields-fieldvalue = gv_sel .
        APPEND lw_dynpfields TO lt_dynpfields.
        CALL FUNCTION 'DYNP_VALUES_UPDATE'
          EXPORTING
            dyname               = 'Z_MAINPROG'
            dynumb               = '0300'
          TABLES
            dynpfields           = lt_dynpfields
          EXCEPTIONS
            invalid_abapworkarea = 1
            invalid_dynprofield = 2
            invalid_dynproname   = 3
            invalid_dynpronummer = 4
            invalid_request      = 5
            no_fielddescription = 6
            undefind_error       = 7
            OTHERS               = 8.
        IF sy-subrc <> 0.
          MESSAGE ID sy-msgid TYPE sy-msgty NUMBER sy-msgno
                  WITH sy-msgv1 sy-msgv2 sy-msgv3 sy-msgv4.
        ENDIF.
We get Sy-subrc as 0. No error and no update.
Thanks in advance.
Regards,
Ravi

Do you flush to synchronize the itab from frontend?
In Debugger, is the column updated via 'X' for the checkboxes?
please insert cl_gui_cfw=>flush. to sync in PAI before analyzing the table.
Regards,
Christian

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