Update values of columns of ALV grid according to the edited field.

Hi Experts,

In an editable ALV

Lets take columns A B C

A = B + C

B is editable.

how A be updated according to B's edited value.

I used the following code to update the Internal table:

I want to know how can i re-display the updated A value according to B.

DATA : lv_ref_grid TYPE REF TO cl_gui_alv_grid.

to reflect the data changed into internal table

       IF lv_ref_grid IS INITIAL.

         CALL FUNCTION 'GET_GLOBALS_FROM_SLVC_FULLSCR'

           IMPORTING

             e_grid = lv_ref_grid.

       ENDIF.

       IF NOT lv_ref_grid IS INITIAL.

         CALL METHOD lv_ref_grid->check_changed_data.

       ENDIF.