关于委外加工单组件更新的问题

下面的P_CHANGE为D跟I的时候都是OK的，但是用U就不行
*--------------------------------------------------------------------*
*-----原料POCOMPONENTS
*--------------------------------------------------------------------*
****-----第1行
G_CHANGE_ID = P_CHANGE."'D'.
G_ITEM_NO = G_ITEM_NO + 1.
GS_POCOMPONENTS-PO_ITEM = '00010'.
GS_POCOMPONENTS-SCHED_LINE = '0001'.
GS_POCOMPONENTS-ITEM_NO = G_ITEM_NO. "'0001'.
GS_POCOMPONENTS-MATERIAL = '000000002800200001'.
GS_POCOMPONENTS-ENTRY_QUANTITY = 1003.
GS_POCOMPONENTS-PLANT = '1000'.
GS_POCOMPONENTS-REQ_DATE = SY-DATUM.
GS_POCOMPONENTS-ENTRY_UOM = 'TON'.
GS_POCOMPONENTS-CHANGE_ID = G_CHANGE_ID."'I'.
APPEND GS_POCOMPONENTS TO GT_POCOMPONENTS.
****-----填充要修改字段的参数
CLEAR GS_POCOMPONENTSX.
PERFORM FILL_CHECK_STRUCTURE USING 'BAPIMEPOCOMPONENTX'
'GS_POCOMPONENTS'
'GS_POCOMPONENTSX'
C_X.
GS_POCOMPONENTSX-PO_ITEM = GS_POCOMPONENTS-PO_ITEM.
GS_POCOMPONENTSX-SCHED_LINE = GS_POCOMPONENTS-SCHED_LINE.
GS_POCOMPONENTSX-ITEM_NO = GS_POCOMPONENTS-ITEM_NO.
APPEND GS_POCOMPONENTSX TO GT_POCOMPONENTSX.
****-----第2行
G_ITEM_NO = G_ITEM_NO + 1.
GS_POCOMPONENTS-PO_ITEM = '00010'.
GS_POCOMPONENTS-SCHED_LINE = '0001'.
GS_POCOMPONENTS-ITEM_NO = G_ITEM_NO. "'0001'.
GS_POCOMPONENTS-MATERIAL = '000000002800200001'.
GS_POCOMPONENTS-ENTRY_QUANTITY = 1004.
GS_POCOMPONENTS-PLANT = '1000'.
GS_POCOMPONENTS-REQ_DATE = SY-DATUM.
GS_POCOMPONENTS-ENTRY_UOM = 'TON'.
GS_POCOMPONENTS-CHANGE_ID = G_CHANGE_ID."'I'.
APPEND GS_POCOMPONENTS TO GT_POCOMPONENTS.
****-----填充要修改字段的参数
CLEAR GS_POCOMPONENTSX.
PERFORM FILL_CHECK_STRUCTURE USING 'BAPIMEPOCOMPONENTX'
'GS_POCOMPONENTS'
'GS_POCOMPONENTSX'
C_X.
GS_POCOMPONENTSX-PO_ITEM = GS_POCOMPONENTS-PO_ITEM.
GS_POCOMPONENTSX-SCHED_LINE = GS_POCOMPONENTS-SCHED_LINE.
GS_POCOMPONENTSX-ITEM_NO = GS_POCOMPONENTS-ITEM_NO.
APPEND GS_POCOMPONENTSX TO GT_POCOMPONENTSX.
*--------------------------------------------------------------------*
*-----计划行POSCHEDULE
*--------------------------------------------------------------------*
LOOP AT BAPI_POSCHEDULE.
CLEAR :GS_POSCHEDULE,GS_POSCHEDULEX.
MOVE-CORRESPONDING BAPI_POSCHEDULE TO GS_POSCHEDULE.
APPEND GS_POSCHEDULE TO GT_POSCHEDULE.
PERFORM FILL_CHECK_STRUCTURE USING 'bapimeposchedulx'
'gs_poschedule'
'gs_poschedulex'
C_X.
GS_POSCHEDULEX-PO_ITEM = BAPI_POSCHEDULE-PO_ITEM. "采购凭证的项目编号 zift_mm003_matnr-ebelp
GS_POSCHEDULEX-SCHED_LINE = BAPI_POSCHEDULE-SCHED_LINE.
APPEND GS_POSCHEDULEX TO GT_POSCHEDULEX.
ENDLOOP.
*--------------------------------------------------------------------*
*-----执行BAPI
*--------------------------------------------------------------------*
CALL FUNCTION 'BAPI_PO_CHANGE'
EXPORTING
PURCHASEORDER = P_EBELN"GS_PURCHASEORDER
TABLES
RETURN = GT_RETURN
POITEM = GT_POITEM
POITEMX = GT_POITEMX
POSCHEDULE = GT_POSCHEDULE
POSCHEDULEX = GT_POSCHEDULEX
POCOMPONENTS = GT_POCOMPONENTS
POCOMPONENTSX = GT_POCOMPONENTSX.
CALL FUNCTION 'BAPI_TRANSACTION_COMMIT'
EXPORTING
WAIT = 'X'.

贴吧有人知道吗？是否跟补丁版本什么相关？

REPORT z_barry_test LINE-SIZE 140 NO STANDARD PAGE HEADING .
DATA :return TYPE bapiret2 OCCURS 0 WITH HEADER LINE,
poschedule TYPE bapimeposchedule OCCURS 0 WITH HEADER LINE,
poschedulex TYPE bapimeposchedulx OCCURS 0 WITH HEADER LINE,
pocomponents LIKE bapimepocomponent OCCURS 0 WITH HEADER LINE,
pocomponentsx LIKE bapimepocomponentx OCCURS 0 WITH HEADER LINE.
PARAMETERS p_ebeln LIKE ekko-ebeln.
START-OF-SELECTION.
CALL FUNCTION 'BAPI_PO_GETDETAIL1'
EXPORTING
purchaseorder = p_ebeln
TABLES
return = return
pocomponents = pocomponents
poschedule = poschedule.
READ TABLE poschedule INDEX 1.
CLEAR poschedule[].
poschedule-quantity = poschedule-quantity - 1 .
APPEND poschedule.
poschedulex-po_item = poschedule-po_item.
poschedulex-sched_line = poschedule-sched_line .
poschedulex-quantity = 'X'.
APPEND poschedulex TO poschedulex.
READ TABLE pocomponents WITH KEY po_item = poschedule-po_item
sched_line = poschedule-sched_line.
DELETE pocomponents WHERE po_item = poschedule-po_item AND
sched_line = poschedule-sched_line .
pocomponents-entry_quantity = pocomponents-entry_quantity - 1 .
pocomponents-change_id = 'U'.
APPEND pocomponents .
pocomponentsx-po_item = pocomponents-po_item .
pocomponentsx-sched_line = pocomponents-sched_line .
pocomponentsx-item_no = pocomponents-item_no .
pocomponentsx-entry_quantity = 'X'.
pocomponentsx-change_id = 'X'.
APPEND pocomponentsx.
poschedule-sched_line = poschedule-sched_line + 1 .
poschedule-delivery_date = '2010.11.11'.
poschedule-quantity = 1.
APPEND poschedule.
poschedulex-po_item = poschedule-po_item.
poschedulex-sched_line = poschedule-sched_line .
poschedulex-quantity = 'X'.
poschedulex-delivery_date = 'X'.
APPEND poschedulex TO poschedulex.
READ TABLE pocomponents WITH KEY po_item = poschedule-po_item
sched_line = poschedule-sched_line.
DELETE pocomponents WHERE po_item = poschedule-po_item AND
sched_line = poschedule-sched_line .
pocomponents-entry_quantity = 1 .
pocomponents-sched_line = pocomponents-sched_line + 1 .
pocomponents-change_id = 'i'.
APPEND pocomponents .
pocomponentsx-po_item = pocomponents-po_item .
pocomponentsx-sched_line = pocomponents-sched_line .
pocomponentsx-item_no = pocomponents-item_no .
pocomponentsx-entry_quantity = 'X'.
pocomponentsx-material = 'X'.
pocomponentsx-change_id = 'X'.
APPEND pocomponentsx.
CALL FUNCTION 'BAPI_PO_CHANGE'
EXPORTING
purchaseorder = p_ebeln
TABLES
return = return
poschedule = poschedule
poschedulex = poschedulex
pocomponents = pocomponents
pocomponentsx = pocomponentsx.
CALL FUNCTION 'BAPI_TRANSACTION_COMMIT'
EXPORTING
wait = 'X'.
WRITE 'ok'.

ME_COMPONENTS_UPDATE

预留 是跟计划对应的，把原计划删除。新建计划行，也就新的预留 了。
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做好事不留名，我叫 吉林

我在用BAPI_PO_CHANGE删除委外采购订单组件的时候，返回消息一直是S 未更改任何数据。
请问这是怎么回事啊？