Field restriction for ME22N using BADI

Dear All,
i had a requirement in which i had to restrict ME22N transaction for a particular user for a particular document type
so i used BADI ME_PROCESS_PO_CUST now the requirement has changed and the user wants the restriction only on three fields rather than entire transaction.
is there any provision in BADi by which i can prevent changes made to a particular fields the fields are QUANTITY,RATE PER UNIT & PAYMENT TERMS fields,by throwing error message if changes are done and for other fields changes should be allowed .
my code is as below
method IF_EX_ME_PROCESS_PO_CUST~CHECK.
IF SY-TCODE = 'ME22N'.
DATA: IT_MEPOHEADER TYPE MEPOHEADER.
    IT_MEPOHEADER = IM_HEADER->GET_DATA( ).
     IF IT_MEPOHEADER-BSART = 'ZLNB' OR IT_MEPOHEADER-BSART = 'ZLUB' OR IT_MEPOHEADER-BSART = 'ZLS'
        OR IT_MEPOHEADER-BSART = 'ZLC' OR IT_MEPOHEADER-BSART = 'ZLFO' OR IT_MEPOHEADER-BSART = 'ZLLN'
          OR IT_MEPOHEADER-BSART = 'ZLDB'.
       IF SY-SUBRC = 0.
            IF SY-UNAME = 'ABAP05' .
                    Message 'You are not authorized to use ME22N for the given document type' type 'E'.
             ENDIF.
         ENDIF.
      ENDIF.
     ENDIF.
endmethod.
can anyone plz help me
Thanks in advance,
Ronak

Dear All,
plz let me know if there is any other alternative (other than BADI) to restrict based on filteration for user , document type , and the three fields i have mentioned..
Regards Ronak

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 CALL FUNCTION 'YMEPOBADIEX_GET_DATA'
 EXPORTING
 im_ebeln = ls_mepoitem-ebeln
 im_ebelp = ls_mepoitem-ebelp
 IMPORTING
 ex_data = ls_customer.
store info for later use
 MOVE-CORRESPONDING ls_mepoitem TO dynp_data_pbo.
 MOVE ls_customer-badi_bsgru TO dynp_data_pbo-badi_bsgru.
 MOVE ls_customer-badi_afnam TO dynp_data_pbo-badi_afnam.
 WHEN OTHERS.
ENDCASE.
endif.
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 WHEN subscreen1.
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 WHEN OTHERS.
ENDCASE.
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CASE im_name.
 WHEN subscreen1.
 CALL FUNCTION 'YMEPOBADIEX_POP'
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 ex_dynp_data = dynp_data_pai.
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 re_changed = mmpur_yes.
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 ls_mepoitem TYPE mepoitem,
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CASE im_name.
 WHEN subscreen1.
is it an item? im_model can be header or item.
 mmpur_dynamic_cast l_item im_model.
 CHECK NOT l_item IS INITIAL.
 ls_mepoitem = l_item->get_data( ).
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 IF dynp_data_pbo-matkl NE dynp_data_pai-matkl OR
 dynp_data_pbo-plifz NE dynp_data_pai-plifz OR
 dynp_data_pbo-webaz NE dynp_data_pai-webaz.
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 ls_mepoitem-matkl = dynp_data_pai-matkl.
 ls_mepoitem-plifz = dynp_data_pai-plifz.
 ls_mepoitem-webaz = dynp_data_pai-webaz.
 CALL METHOD l_item->set_data( ls_mepoitem ).
 ENDIF.
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 im_ebeln = ls_mepoitem-ebeln
 im_ebelp = ls_mepoitem-ebelp
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 ex_data = ls_customer.
 ls_customer-badi_bsgru = dynp_data_pai-badi_bsgru.
 ls_customer-badi_afnam = dynp_data_pai-badi_afnam.
 CALL FUNCTION 'YMEPOBADIEX_SET_DATA'
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 im_data = ls_customer.
 ENDIF.
 WHEN OTHERS.
ENDCASE.
ENDIF.
method IF_EX_ME_PROCESS_PO_CUST~FIELDSELECTION_ITEM.
DATA: l_persistent TYPE mmpur_bool.
CONSTANTS:
FIELD-SYMBOLS: <fs> LIKE LINE OF ch_fieldselection.
l_persistent = im_item->is_persistent( ).
*IF l_persistent EQ mmpur_yes.
READ TABLE ch_fieldselection ASSIGNING <fs> WITH TABLE KEY
 metafield = MMMFD_YYMAN_NUM."fd_cust_01.
IF sy-subrc IS INITIAL.
<fs>-fieldstatus = '*'. " Display <-- this one was as per the sample code given.
<fs>-fieldstatus = '+'. " Input <-- this i added to make the field mandatory.
ENDIF.
READ TABLE ch_fieldselection ASSIGNING <fs> WITH TABLE KEY
 metafield = MMMFD_YYMAN_DES."fd_cust_01.
IF sy-subrc IS INITIAL.
<fs>-fieldstatus = '*'. " Display <-- this one was as per the sample code given.
<fs>-fieldstatus = '+'. " Input <-- this i added to make the field mandatory.
ENDIF.
*ENDIF.
ENDIF.
endmethod.

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