Problem : Modify (bopf) don´t change table data.

Dear experts.

I have a code and i need to save items data then my code is :

  /scmtms/cl_mod_helper=>mod_create_multi(

     EXPORTING

       it_data        = lt_fo_item

       iv_node        = /scmtms/if_tor_c=>sc_node-item_tr

       iv_source_node = /scmtms/if_tor_c=>sc_node-root

       iv_association = /scmtms/if_tor_c=>sc_association-root-item_tr

     CHANGING

       ct_mod         = lt_mod ).

and after:

lo_fo_srvmgr = /bobf/cl_tra_serv_mgr_factory=>get_service_manager( /scmtms/if_tor_c=>sc_bo_key ).

   lo_fo_srvmgr->modify(

     EXPORTING

       it_modification = lt_mod

     IMPORTING

       eo_change = lo_change

       eo_message = lo_message ).

   IF lo_message IS BOUND .

     /scmtms/cl_common_helper=>msg_convert_bopf_2_bapiret2(

        EXPORTING

          io_message  = lo_message

        CHANGING

          ct_bapiret2 = lt_return[] ).

AND AFTER I USE SAVE.

MY PROBLEM IS :

1-I HAVE THE SAME VALUE FOO FIELD SRC_STOP_KEY = 2E262DF48B721ED596E496888A98A5F1  IN TWO LINES OF ITEM BEFORE CALL   /scmtms/cl_mod_helper=>mod_create_multi(  AND BEFORE THE MODIFY .

WHY , WHEN I GO TO SEE IT IN /N/BOBF/TEST_UI TRANSACTION   THE ITEM TABLE HAVE DIFERENT VALUES FOR FIELD SRC_STOP_KEY ?

MY CODE DONT CREATED CORRECTLY.

DO YOU  KNOW WHY OR HAVE SUGGESTIONS ?

THANKSW.