How to change PO price by BADI ME_PROCESS_PO_CUST

[CCyndy]

While I am changing PO price at ME_PROCESS_PO_CUST~PROCESS_ITEM with code like followed, but the price will be changed after check(save) button clicked.

    DATA: lt_pr1      TYPE mmpur_tkomv.
    CALL METHOD im_item->get_conditions
      IMPORTING
        ex_conditions = lt_pr1.

    READ TABLE lt_pr1 ASSIGNING FIELD-SYMBOL(<pr1>) WITH KEY kschl = 'PB00'.
    IF sy-subrc = 0.
      <pr1>-kbetr = <pr1>-kposn.
      CALL METHOD im_item->set_conditions
        EXPORTING
          im_conditions = lt_pr1.
    ENDIF.

as the code , I succeed change price of item 10 to 10, and item 20 to 20; but after I saved it or clicked the check button, the price of item 20 will be changed to 10

[CCyndy]

This question has been bothering me for a long time and I cannot find the answer. I am grateful for someone who can guide me

[Azeemquadri]

When do you want the price change to happen. Does it happen on save.

[CCyndy]

as the code , I succeed change price of item 10 to 10, and item 20 to 20;

but after I saved PO or clicked the check button, the price of item 20 will be changed to 10

[CCyndy]

..