Unprotect a Protected Field?

I am trying to change the GL Account in Code 1 below. However, when the logic flows into CODE2, the field is protected = 'X'. And, the field is not changeable on the Purchase Requisition tab as well for a scenario I am working on.
I assume that because it is not changeable, and 'protected', that my ABAP code can not change it? correct?
Is there a way to unprotect it, or is this something configured in SPRO for a Purchase Requisition?
CODE1: Is my custom code.
CODE2: Is the SAP code that my will flow into where this field appears to be unchangeable.
Thank-You
(CODE1)
METHOD IF_EX_ME_PROCESS_REQ_CUST~PROCESS_HEADER.
*Purchase Requisition Item Declarations
DATA: LT_ITEMS        TYPE MMPUR_REQUISITION_ITEMS.
DATA: LS_ITEM         TYPE MEREQ_ITEM.
FIELD-SYMBOLS: <FS_ITEM> TYPE LINE OF MMPUR_REQUISITION_ITEMS.
*Purchase Requisition Accounting Declarations.
DATA: LT_ACCT         TYPE MMPUR_ACCOUNTING_LIST.
DATA: LS_ACCT         TYPE EXKN.
DATA: LS_SETX          TYPE MEPOACCOUNTING_DATAX.
FIELD-SYMBOLS: <FS_ACCT> TYPE LINE OF MMPUR_ACCOUNTING_LIST.
CALL METHOD IM_HEADER->GET_ITEMS
    RECEIVING
      RE_ITEMS = LT_ITEMS.
LOOP AT LT_ITEMS ASSIGNING <FS_ITEM>.
    LS_ITEM = <FS_ITEM>-ITEM->GET_DATA( ).
    LT_ACCT = <FS_ITEM>-ITEM->IF_ACCT_CONTAINER_MM~GET_ITEMS( ).
    LOOP AT LT_ACCT ASSIGNING <FS_ACCT>.
      LS_ACCT = <FS_ACCT>-MODEL->GET_EXKN( ).
      LS_ACCT-SAKTO = 'N500300   '.
      LS_SETX-SAKTO = 'X'.
      <FS_ACCT>-MODEL->SET_EXKN( LS_ACCT ).
      <FS_ACCT>-MODEL->SET_EXKNX( LS_SETX ).
    ENDLOOP.
ENDLOOP.
ENDMETHOD.
(CODE2)
METHOD if_accounting_model_mm~set_exkn.
DATA: ls_buffer     LIKE LINE OF my_data_input_buffer,
        ls_bufferx    LIKE LINE OF my_data_input_bufferx,
        l_buffered    TYPE sy-subrc,
        l_data_old    TYPE exkn,
        l_data_oldx   TYPE mepoaccounting_datax,
        l_data_newx   TYPE mepoaccounting_datax,
        l_indx        TYPE sy-tabix.      "1478013
*PROTECT EQ 'X'
CHECK my_state->protect EQ mmpur_no.

did you check the code written inside method PROTECT?

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ShrtText
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Check OSS notes as below am not sure if it helps
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T:: +61 3 9864 7107
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www.pearsontrueman.com<http://www.pearsontrueman.com>
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Message was edited by: BPrice

Cannot override protected fields

I know this is not possible, but my question is why did they design it
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protected String getName(){return name;}
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