BAPI_SALESORDER_CHANGE - extensionin not working

Hi Guys,

I have added a checkbox "zzpump_reqd" in the Sales Order screen at item-level. When I try to update this field using BAPI_SALESORDER_CHANGE it is not getting updated. The custom field is getting updated without any issues when I try to create a sales order using BAPI_SALESORDER_CREATEFROMDAT2.

I have updated the following tables / structures with the custom field.

VBAP

VBAPKOZ

VBAPKOZX

BAPE_VBAP

BAPE_VBAPX

VBAPKOM

VBAPKOMX

The BAPI in the below program returns the below successful messages.

ORDER_HEADER_IN has been processed successfully

ITEM_IN has been processed successfully

Order XXXXXX has been saved

Could you please let me know why my code is not working.

PARAMETERS: p_vbeln TYPE vbak-vbeln.
DATA: t_line        LIKE bapisditm  OCCURS 0 WITH HEADER LINE.
DATA: t_linex       LIKE bapisditmx OCCURS 0 WITH HEADER LINE.
DATA: t_exten       LIKE bapiparex  OCCURS 0 WITH HEADER LINE.
DATA: t_return      LIKE bapiret2   OCCURS 0 WITH HEADER LINE.
DATA: bape_vbap     LIKE bape_vbap.
DATA: bape_vbapx    LIKE bape_vbapx.
DATA: order_headerx LIKE bapisdh1x.

order_headerx-updateflag = 'U'.
t_line-itm_number = '000010'.
APPEND t_line.


t_linex-itm_number = '000010'.
t_linex-updateflag = 'U'.
APPEND t_linex.


bape_vbap-vbeln = p_vbeln.
bape_vbap-posnr = '000010'.
bape_vbap-zzpump_reqd = 'X'.
t_exten-structure = 'BAPE_VBAP'.
t_exten+30        = bape_vbap.
APPEND t_exten.

bape_vbapx-vbeln = p_vbeln.
bape_vbapx-posnr = '000010'.
bape_vbapx-zzpump_reqd = 'X'.
t_exten-structure = 'BAPE_VBAPX'.
t_exten+30        = bape_vbapx.
APPEND t_exten.

CALL FUNCTION 'BAPI_SALESORDER_CHANGE'
  EXPORTING
    salesdocument    = p_vbeln
    order_header_inx = order_headerx
  TABLES
    return           = t_return
    order_item_in    = t_line
    order_item_inx   = t_linex
    extensionin      = t_exten.
LOOP AT t_return.
  WRITE: / t_return-message.
ENDLOOP.

CALL FUNCTION 'BAPI_TRANSACTION_COMMIT'.