method if_ex_acc_document~change.

    data: wa_extension   type        bapiparex,

          ext_value() type        c,

          wa_accit       type        accit,

          l_ref          type ref to data.

    field-symbols: <l_struc> type any,

                   <l_field> type any.

    sort c_extension2 by structure.

    loop at c_extension2 into wa_extension.

      at new structure.

        create data l_ref type (wa_extension-structure).

        assign l_ref->* to <l_struc>.

      endat.

      concatenate wa_extension-valuepart1 wa_extension-valuepart2

                  wa_extension-valuepart3 wa_extension-valuepart4

             into ext_value.

      move ext_value to <l_struc>.

      assign component 'POSNR' of structure <l_struc> to <l_field>.

      read table c_accit with key posnr = <l_field>

            into wa_accit.

      if sy-subrc is initial.

        move-corresponding <l_struc> to wa_accit.

        modify c_accit from wa_accit index sy-tabix.

      endif.

    endloop.

  endmethod.