Update EKPV-KUNNR in shipping tab of ME21N/ME22N

Question

Hello,
I have a requirement where I have to update EKPV-KUNNR with a new value.
I tried to use BADI ME_PROCESS_PO_CUST Method PROCESS_ITEM.
I am using get_shipping_data to get the shipping details and then modifying EKPV-KUNNR and calling set_shipping_data but this is not getting updated.
I found out that in set_shipping_data, there is an old record and new record, and in new record only few fields are changed and because of that old_record is always equal to new_record and that is why my changed customer number is not updated.
Code in set_shipping_data
  l_data_old = me->if_purchase_order_item_mm~get_shipping_data( ).
* initial transfer from BAPI interface (old_data always empty)
  IF l_parent->for_bapi EQ mmpur_no.
    CHECK NOT l_data_old IS INITIAL.
  ENDIF.
  l_data_new = l_data_old. 
MOVE: im_ekpv-vstel TO l_data_new-vstel,
        im_ekpv-lprio TO l_data_new-lprio,
        im_ekpv-vsbed TO l_data_new-vsbed,
        im_ekpv-route TO l_data_new-route,
        im_ekpv-ablad TO l_data_new-ablad,
        im_ekpv-spe_auth_number  TO l_data_new-spe_auth_number,
        im_ekpv-spe_src_dlv_no   TO l_data_new-spe_src_dlv_no,
        im_ekpv-spe_src_exidv    TO l_data_new-spe_src_exidv,
        im_ekpv-spe_inspout_guid TO l_data_new-spe_inspout_guid,
        im_ekpv-spe_follow_up    TO l_data_new-spe_follow_up.
  IF l_data_new NE l_data_old.
    READ TABLE po_ekpv_hash_table INTO wa WITH TABLE KEY item = me.
    IF sy-subrc IS INITIAL.
      wa-data = l_data_new.
      MODIFY TABLE po_ekpv_hash_table FROM wa.
    ELSE.
      wa-item = me.
      wa-data = l_data_new.
      INSERT wa INTO TABLE po_ekpv_hash_table.
    ENDIF.
    ekpv_changed = mmpur_yes.
The issue is that none of the aforementioned fields are being changed so code never goes to l_data_new NE l_data_old where EKPO table is updated.
Can anyone help??

Answer 1

Hi Mehwish,
Yes I debugged it and l_data_old is same as l_data_new but im_ekpv contains changed value of customer number (KUNNR) but this does not affect l_data_new as only
   MOVE: im_ekpv-vstel TO l_data_new-vstel,
         im_ekpv-lprio TO l_data_new-lprio,
         im_ekpv-vsbed TO l_data_new-vsbed,
         im_ekpv-route TO l_data_new-route,
         im_ekpv-ablad TO l_data_new-ablad,
         im_ekpv-spe_auth_number  TO l_data_new-spe_auth_number,
         im_ekpv-spe_src_dlv_no   TO l_data_new-spe_src_dlv_no,
         im_ekpv-spe_src_exidv    TO l_data_new-spe_src_exidv,
         im_ekpv-spe_inspout_guid TO l_data_new-spe_inspout_guid,
         im_ekpv-spe_follow_up    TO l_data_new-spe_follow_up.
these fields are being moved to l_data_new which remain unchanged.
So if any of the above fields changes then only i_data_new is different from l_data_old which is  not happening in my case. Do I need to code somewhere else? Any exit may be?