sap 订单 未找到或不允许货物移动

进行sap物料移库时，返回错误信息"订单 .... 未找到或不允许货物移动".

 bapihead1-pstng_date = date.  "过账日期
  bapihead1-doc_date = date.    "凭证日期
  bapihead1-ref_doc_no = is_tab-EBELN.
  bapihead1-GR_GI_SLIP_NO = is_tab-EBELN.
  bapihead1-header_txt = '采购订单跨工厂移库'  .    "凭证抬头文本
  CLEAR it_item1.
  CLEAR errmsg1.
  LOOP AT it_tab INTO is_tab.
    is_item1-material = is_tab-matnr.
    is_item1-entry_qnt = is_tab-MENGE.
    is_item1-po_pr_qnt = is_tab-MENGE.
    is_item1-stge_loc =  '3100'.  "原有物品的库存地点
    is_item1-move_plant =  is_tab-WERKS_SC ."需要移动到的地方
    is_item1-move_stloc = '3100'.
    is_item1-move_type = '301' .        "移动类型
    is_item1-plant = is_tab-werks.
    is_item1-PO_NUMBER = is_tab-EBELN.
    is_item1-ORDERID = is_tab-VBELN_SC.
    is_item1-ORDER_ITNO = is_tab-POSNR_SC.
    is_item1-PO_ITEM = is_tab-EBELP.
    is_item1-no_more_gr = 'X'.
    is_item1-MVT_IND = 'F'.
    is_item1-entry_uom = i_tab-VRKME.
    is_item1-BATCH = is_tab-EBELN.
    APPEND is_item1 TO it_item1.
  ENDLOOP.
  CALL FUNCTION 'BAPI_GOODSMVT_CREATE'
    EXPORTING
      goodsmvt_header  = bapihead1
      goodsmvt_code    = '04'
    IMPORTING
      materialdocument = lh_input_mblnr
    TABLES
      goodsmvt_item    = it_item1
      return           = errmsg1.
  CALL FUNCTION 'BAPI_TRANSACTION_COMMIT'
      EXPORTING
        wait = 'X'.