ABAP Webdynpro error in supply function for a singleton - abap

Question

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
I have created two controllers
Componentcontroller is bound to flightinfo table. This table is populated. However, if_componentcontroller=>element_flightinfo dosen't fetch any data. Why?
Customcontroller2 is bound to bookingtab table.
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.**
Definition of parent_element, and stru_flights structure
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.**
implicit constant definition for context node bookingtab types:
Element_bookingtab type SBOOK,
Elements_bookingtab type standard table of Element_bookingtab with default key.