单例供应函数中的ABAP Webdynpro错误

我已经创建了两个控制器

Componentcontroller已绑定到flightinfo表。此表已填充。但是，如果_componentcontroller=>element _flightinfo不获取任何数据。为什么?

Customcontroller2已绑定到bookingtab表

The following error text was processed in system EH5 : Invalid operand type for the MOVE-CORRESPONDING statement.
◾ The error occurred on the application server CRMEHP2_EH5_24 and in the work process 8 . 
◾ The termination type was: RABAX_STATE
◾ The ABAP call stack was: 
Method: IF_WD_CONTEXT_ELEMENT~GET_STATIC_ATTRIBUTES of program CL_WDR_CONTEXT_ELEMENT========CP
Method: BOOKINGS_READ of program /1BCWDY/0AA4D2ZOSMXD1LD8M8M2==CP
Method: BOOKINGS_READ of program /1BCWDY/0AA4D2ZOSMXD1LD8M8M2==CP
Method: SUPPLY_ELEMENTS of program CL_WDR_CONTEXT_NODE_VAL=======CP
Method: IF_WD_CONTEXT_NODE~GET_LEAD_SELECTION of program CL_WDR_CONTEXT_NODE_VAL=======CP
Method: IF_WD_CONTEXT_NODE~GET_LEAD_SELECTION of program CL_WDR_CONTEXT_NODE_MAP=======CP
Method: GET_LEAD_SELECTION of program CL_WDR_TABLE_DATA_PROVIDER====CP
Method: UPDATE_RANGE_SELECT_START of program CL_WDR_TABLE_DATA_PROVIDER====CP
Method: GET_TABLE_DATA of program CL_WDR_TABLE_DATA_PROVIDER====CP
Method: GET_VISIBLE_TABLE_DATA of program CL_WDR_TABLE_DATA_PROVIDER====CP

父元素和结构的定义

Method:
**METHOD bookings_read.**
  DATA:
    stru_flight             TYPE if_componentcontroller=>element_flightinfo,
    itab_booking            TYPE if_customcontroller2=>elements_bookingtab.

* Get Parent Element.
* Error is here: All attributes of stru_flight are either blank or zero.
* The error disappears once CALL METHOD is commented.
  CALL METHOD parent_element->get_static_attributes
    IMPORTING
      static_attributes = stru_flight.

* read bookings
*Rest of the satatements work fine.
  SELECT * FROM sbook
    INTO CORRESPONDING FIELDS OF TABLE itab_booking
    WHERE carrid = stru_flight-carrid
      AND connid = stru_flight-connid
      AND fldate = stru_flight-fldate.

* bind all the elements
  node->bind_table(
    new_items =  itab_booking
    set_initial_elements = abap_true ).

**ENDMETHOD.**

• 上下文节点bookingtab类型的隐式常量定义：
  元素\u bookingtab类型SBOOK， Elements\u bookingtab类型带有默认键的Element\u bookingtab的标准表

---

如果&u customcontroller2=>elements\u bookingtab，那么

的类型声明是什么？如何声明“父元素”上下文节点？如果您希望人们帮助您，请提供更多相关信息。
if\u customcontroller2=>elements\u bookingtab
的类型声明是什么？如何声明“parent element”上下文节点？如果您希望人们帮助您，请提供更多相关信息。
NODE    Importing   IF_WD_CONTEXT_NODE      
PARENT_ELEMENT  Importing   IF_WD_CONTEXT_ELEMENT       
stru_flight             TYPE if_componentcontroller=>element_flightinfo,

  **CALL METHOD parent_element->get_static_attributes
    IMPORTING
      static_attributes = stru_flight.**