Problem handling data_changed event in OO ALV

Question

I'm displaying my internal table with an OO ALV and I'm trying to handle the data_changed event in order to do some checking before actually modify my internal table.
this is the code of how I was planing to do that:
handle_data_changed
        FOR EVENT data_changed OF cl_gui_alv_grid
            IMPORTING er_data_changed
                      e_onf4
                      e_onf4_before
                      e_onf4_after
                      e_ucomm.
METHOD handle_data_changed.
*    IF er_data_changed->mt_mod_cells-fieldname = 'COD_M'.
*         do something
*    else if er_data_changed->mt_mod_cells-fieldname = 'QUANTIDADE'.
*         do something else
*    endif.
*  alv->refresh_table_display.
  ENDMETHOD.                           "handle_data_changed
but it gives me this error:
"MT_MOD_CELLS" is a table without a header line and therefore has no component called "FIELDNAME".
My question is, how can access the cell that is being modified, and the new data?

Answer 1

Dont know if this is the most clever way to do it but i solved it like this
DATA: wa_data_changed TYPE lvc_s_modi,
          wa_tabi TYPE zsl_mat_c.
    READ TABLE er_data_changed->mt_mod_cells INDEX 1
                                             INTO wa_data_changed.
    IF wa_data_changed-fieldname = 'COD_M'.
*     do something
    ELSEIF wa_data_changed-fieldname = 'QUANTIDADE'.
*     do something else
    ENDIF.
thanks for your help