Error in BAPI_SALESORDER_CHANGE

Question

I need to post the changed incoterm value by using BAPI_SALESORDER_CHANGE. But everytime I used to get the error:
Field header_inx-updateflag is not an input field.
I have written the below mentioned code : 
*& Report  ZBAPI1                                                      *
REPORT  ZBAPI1                                  .
TABLES: VBBE.
DATA: BEGIN OF ITAB OCCURS 0,
      VBELN LIKE VBBE-VBELN,
      POSNR LIKE VBBE-POSNR,
      END OF ITAB.
DATA: WA_ITAB LIKE LINE OF ITAB.
DATA:BEGIN OF I_VBELN OCCURS 0.
        INCLUDE STRUCTURE BAPIVBELN.
DATA:END OF I_VBELN.
DATA: WA_I_VBELN LIKE LINE OF I_VBELN.
DATA:BEGIN OF I_SHEADER OCCURS 0.
        INCLUDE STRUCTURE BAPISDH1X.
DATA:END OF I_SHEADER.
DATA: WA_I_SHEADER LIKE LINE OF I_SHEADER.
DATA:BEGIN OF ZRETURN OCCURS 0.
        INCLUDE STRUCTURE BAPIRET2.
DATA:END OF ZRETURN.
DATA: WA_ZRETURN LIKE LINE OF ZRETURN.
DATA:BEGIN OF I_SITEM OCCURS 0.
        INCLUDE STRUCTURE BAPISDITM.
DATA:END OF I_SITEM.
DATA: WA_I_SITEM LIKE LINE OF I_SITEM.
DATA:BEGIN OF I_SITEMX OCCURS 0.
        INCLUDE STRUCTURE BAPISDITMX.
DATA:END OF I_SITEMX.
DATA: WA_I_SITEMX LIKE LINE OF I_SITEMX.
DATA:BEGIN OF ZRETURN1 OCCURS 0.
        INCLUDE STRUCTURE BAPIRET2.
DATA:END OF ZRETURN1.
DATA: WA_ZRETURN1 LIKE LINE OF ZRETURN1.
PARAMETERS: P_VBELN LIKE BAPIVBELN-VBELN,
            P_INCO1 LIKE BAPISDITEM-INCOTERMS1.
SELECT VBELN
       POSNR FROM VBBE INTO TABLE ITAB
         WHERE VBELN = P_VBELN.
DELETE ADJACENT DUPLICATES FROM ITAB COMPARING VBELN POSNR.
CLEAR: I_SHEADER, I_VBELN, I_SITEM,I_SITEMX,
       ZRETURN, ZRETURN1.
REFRESH: I_SHEADER, I_VBELN, I_SITEM,I_SITEMX,
         ZRETURN, ZRETURN1.
LOOP AT ITAB INTO WA_ITAB.
  WA_I_SHEADER-UPDATEFLAG = 'U'.
  WA_I_SHEADER-INCOTERMS1 = 'X'.
  APPEND WA_I_SHEADER TO I_SHEADER.
  WA_I_VBELN-VBELN = WA_ITAB-VBELN.
  APPEND WA_I_VBELN TO I_VBELN.
  WA_I_SITEM-ITM_NUMBER = WA_ITAB-POSNR.
  WA_I_SITEM-INCOTERMS1 = P_INCO1.
  APPEND WA_I_SITEM TO I_SITEM.
  WA_I_SITEMX-ITM_NUMBER = WA_ITAB-POSNR.
  WA_I_SITEMX-INCOTERMS1 = 'X'.
  APPEND WA_I_SITEMX TO I_SITEMX.
  CLEAR: WA_ITAB, WA_I_VBELN, WA_I_SHEADER, WA_ZRETURN, WA_ZRETURN1,
         WA_I_SITEM, WA_I_SITEMX.
ENDLOOP.
CALL FUNCTION 'BAPI_SALESORDER_CHANGE'
  EXPORTING
    SALESDOCUMENT               = I_VBELN
  ORDER_HEADER_IN             =
    ORDER_HEADER_INX            = I_SHEADER
  SIMULATION                  =
  BEHAVE_WHEN_ERROR           = ' '
  INT_NUMBER_ASSIGNMENT       = ' '
  LOGIC_SWITCH                =
  TABLES
    RETURN                      = ZRETURN
    ORDER_ITEM_IN               = I_SITEM
    ORDER_ITEM_INX              = I_SITEMX
  PARTNERS                    =
  PARTNERCHANGES              =
  PARTNERADDRESSES            =
  ORDER_CFGS_REF              =
  ORDER_CFGS_INST             =
  ORDER_CFGS_PART_OF          =
  ORDER_CFGS_VALUE            =
  ORDER_CFGS_BLOB             =
  ORDER_CFGS_VK               =
  ORDER_CFGS_REFINST          =
  SCHEDULE_LINES              =
  SCHEDULE_LINESX             =
  ORDER_TEXT                  =
  ORDER_KEYS                  =
  CONDITIONS_IN               =
  CONDITIONS_INX              =
  EXTENSIONIN                 =
CALL FUNCTION 'BAPI_TRANSACTION_COMMIT'
  EXPORTING
    WAIT   = ' '
  IMPORTING
    RETURN = ZRETURN1.
WRITE:/'SY_SUBRC: ', SY-SUBRC.
LOOP AT ZRETURN.
  WRITE:/ ZRETURN-MESSAGE, ZRETURN-TYPE.
ENDLOOP.
IF SY-SUBRC EQ 0.
LOOP AT ZRETURN1.
    WRITE:/ ZRETURN1-MESSAGE, ZRETURN1-TYPE.
ENDLOOP.
ENDIF.
CLEAR: I_SHEADER, I_VBELN, I_SITEM,I_SITEMX,
       ZRETURN, ZRETURN1.
REFRESH: I_SHEADER, I_VBELN, I_SITEM,I_SITEMX,
         ZRETURN, ZRETURN1.
Please do help me in solving the problem.
thanks & regards,
nitya

Answer 1

I have added the order_header_inx but still the same error comes. I am sending you the code :
*& Report  ZBAPI1                                                      *
REPORT  ZBAPI1                                  .
TABLES: VBBE, VBKD.
DATA: BEGIN OF ITAB OCCURS 0,
      VBELN LIKE VBBE-VBELN,
      POSNR LIKE VBBE-POSNR,
      END OF ITAB.
DATA: WA_ITAB LIKE LINE OF ITAB.
DATA: BEGIN OF ITAB1 OCCURS 0.
        INCLUDE STRUCTURE VBKD.
DATA: END OF ITAB1.
DATA: ITAB2 LIKE ITAB1.
DATA:BEGIN OF I_VBELN OCCURS 0.
        INCLUDE STRUCTURE BAPIVBELN.
DATA:END OF I_VBELN.
DATA: WA_I_VBELN LIKE LINE OF I_VBELN.
DATA:BEGIN OF I_SHEADERX OCCURS 0.
        INCLUDE STRUCTURE BAPISDH1X.
DATA:END OF I_SHEADERX.
DATA: WA_I_SHEADERX LIKE LINE OF I_SHEADERX.
DATA: BEGIN OF I_SHEADER OCCURS 0.
        INCLUDE STRUCTURE BAPISDH1.
DATA: END OF I_SHEADER.
DATA: WA_I_SHEADER LIKE LINE OF I_SHEADER.
DATA:BEGIN OF ZRETURN OCCURS 0.
        INCLUDE STRUCTURE BAPIRET2.
DATA:END OF ZRETURN.
DATA: WA_ZRETURN LIKE LINE OF ZRETURN.
DATA:BEGIN OF I_SITEM OCCURS 0.
        INCLUDE STRUCTURE BAPISDITM.
DATA:END OF I_SITEM.
DATA: WA_I_SITEM LIKE LINE OF I_SITEM.
DATA:BEGIN OF I_SITEMX OCCURS 0.
        INCLUDE STRUCTURE BAPISDITMX.
DATA:END OF I_SITEMX.
DATA: WA_I_SITEMX LIKE LINE OF I_SITEMX.
DATA:BEGIN OF ZRETURN1 OCCURS 0.
        INCLUDE STRUCTURE BAPIRET2.
DATA:END OF ZRETURN1.
DATA: WA_ZRETURN1 LIKE LINE OF ZRETURN1.
SELECTION-SCREEN BEGIN OF BLOCK A.
PARAMETERS: P_VBELN LIKE BAPIVBELN-VBELN,
            P_INCO1 LIKE BAPISDITEM-INCOTERMS1.
SELECTION-SCREEN END OF BLOCK A.
AT SELECTION-SCREEN OUTPUT.
  LOOP AT SCREEN.
    IF NOT P_VBELN IS INITIAL.
      READ TABLE ITAB1 INTO ITAB2 WITH KEY VBELN = P_VBELN.
      MOVE ITAB2-INCO1 TO P_INCO1.
      MODIFY SCREEN.
    ENDIF.
    EXIT.
  ENDLOOP.
  SELECT * FROM VBKD INTO TABLE ITAB1.
START-OF-SELECTION.
  SELECT VBELN
         POSNR FROM VBBE INTO TABLE ITAB
           WHERE VBELN = P_VBELN.
  DELETE ADJACENT DUPLICATES FROM ITAB COMPARING VBELN POSNR.
END-OF-SELECTION.
  CLEAR: I_SHEADERX, I_VBELN, I_SITEM,I_SITEMX,I_SHEADER,
         ZRETURN, ZRETURN1.
  REFRESH: I_SHEADERX, I_VBELN, I_SITEM,I_SITEMX,I_SHEADER,
           ZRETURN, ZRETURN1.
  LOOP AT ITAB INTO WA_ITAB.
    WA_I_SHEADERX-UPDATEFLAG ='U'.
    APPEND WA_I_SHEADERX TO I_SHEADERX.
    WA_I_SHEADER-INCOTERMS1 = P_INCO1.
    APPEND WA_I_SHEADER TO I_SHEADER.
    WA_I_VBELN-VBELN = WA_ITAB-VBELN.
    APPEND WA_I_VBELN TO I_VBELN.
    WA_I_SITEM-ITM_NUMBER = WA_ITAB-POSNR.
    WA_I_SITEM-INCOTERMS1 = P_INCO1.
    APPEND WA_I_SHEADER TO I_SHEADER.
    WA_I_SITEMX-ITM_NUMBER = WA_ITAB-POSNR.
    WA_I_SITEMX-UPDATEFLAG ='U'.
    WA_I_SITEMX-INCOTERMS1 ='X'.
    APPEND WA_I_SITEMX TO I_SITEMX.
    CLEAR: WA_ITAB, WA_I_VBELN, WA_I_SHEADERX, WA_ZRETURN, WA_ZRETURN1,
           WA_I_SITEM, WA_I_SITEMX.
  ENDLOOP.
  CALL FUNCTION 'BAPI_SALESORDER_CHANGE'
    EXPORTING
      SALESDOCUMENT               = I_VBELN
      ORDER_HEADER_IN             = I_SHEADER
      ORDER_HEADER_INX            = I_SHEADERX
*   SIMULATION                  =
*   BEHAVE_WHEN_ERROR           = ' '
*   INT_NUMBER_ASSIGNMENT       = ' '
*   LOGIC_SWITCH                =
    TABLES
      RETURN                      = ZRETURN
      ORDER_ITEM_IN               = I_SITEM
      ORDER_ITEM_INX              = I_SITEMX
*   PARTNERS                    =
*   PARTNERCHANGES              =
*   PARTNERADDRESSES            =
*   ORDER_CFGS_REF              =
*   ORDER_CFGS_INST             =
*   ORDER_CFGS_PART_OF          =
*   ORDER_CFGS_VALUE            =
*   ORDER_CFGS_BLOB             =
*   ORDER_CFGS_VK               =
*   ORDER_CFGS_REFINST          =
*   SCHEDULE_LINES              =
*   SCHEDULE_LINESX             =
*   ORDER_TEXT                  =
*   ORDER_KEYS                  =
*   CONDITIONS_IN               =
*   CONDITIONS_INX              =
*   EXTENSIONIN                 =
  CALL FUNCTION 'BAPI_TRANSACTION_COMMIT'
    EXPORTING
      WAIT
      ='X'
    IMPORTING
      RETURN = ZRETURN1.
  WRITE:/'SY_SUBRC: ', SY-SUBRC.
  LOOP AT ZRETURN.
    WRITE:/ ZRETURN-MESSAGE, ZRETURN-TYPE.
  ENDLOOP.
  IF SY-SUBRC EQ 0.
    LOOP AT ZRETURN1.
      WRITE:/ ZRETURN1-MESSAGE, ZRETURN1-TYPE.
    ENDLOOP.
  ENDIF.
  CLEAR: I_SHEADER, I_VBELN, I_SITEM,I_SITEMX,
         ZRETURN, ZRETURN1.
  REFRESH: I_SHEADER, I_VBELN, I_SITEM,I_SITEMX,
           ZRETURN, ZRETURN1.
Thanks for your valuable time
regards,
nitya