Fpm_demo_tabbed_booking_demo

Question

Hi,
I am new to WDA and FPM is a big jump for me.
  I study SAP example of fpm_demo_tabbed_booking_demo by re-created the 3 WD components for Initial screen (ZFPM_INIT) Booking Data screen (ZFM_BOOKING) and Shared component Y_FPM_TABBED_BOOKING_SD.
But I always get message data not found.  In the debug on processing event in Initial screen, It read the input data and get the booking data OK.
  But when I read the contect node passing thru interface controller Y_FPM_TABBED_BOOKING_SD the carrid and connid is empty. Can someone explains to me what I did wrong here?  May be I did not do the configuration correctly?
Here is the code in my processevent in the component controller:
Method process_event.
  DATA lo_nd_airline TYPE REF TO if_wd_context_node.
  DATA lo_el_airline TYPE REF TO if_wd_context_element.
  DATA ls_airline      TYPE wd_this->element_airline_sel.
  IF io_event->mv_event_id EQ if_fpm_constants=>gc_event-leave_initial_screen.
    lo_nd_airline = wd_context->get_child_node( name = wd_this->wdctx_airline_sel ).
    lo_el_airline = lo_nd_airline->get_element(  ).
    lo_el_airline->get_static_attributes(
      IMPORTING
        static_attributes = ls_airline ).
    IF ls_airline-carrid IS INITIAL.
* raise the error message if no carrier id is provided
    ENDIF.
    IF ls_airline-connid IS INITIAL.
* raise the error message if no connid is provided
    ENDIF.
--> At this point, I got the correct carrid and connid.
* Read the booking details from interface of
* My shared component   Y_FPM_TABBED_BOOKING_SD
DATA lo_interfacecontroller TYPE REF TO yiwci__fpm_tabbed_booking_sd .
lo_interfacecontroller =   wd_this->wd_cpifc_fpm_tab_sd( ).
  DATA lv_ev_bookings_count TYPE i.
  lv_ev_bookings_count = lo_interfacecontroller->read_booking_data(
--> Here, in the read_booking_data of the interace component, when it get the context node of  airline carrid and connid
the value data is always empty
* if no booking details are found for the given selection criteria then raise the error message
    IF lv_ev_bookings_count <= 0
      AND NOT ls_airline-carrid IS INITIAL
      AND NOT ls_airline-connid IS INITIAL.
--> I got error msg here
     ENDIF.
ENDMETHOD.
Can someone also explain to me about the concept of hiding tab and what for?  Does it apply in the SAP sample of FPM_DEMO_TABBED_BOOKING_INFO?
Thanks for your help,

Answer 1

Hi Lee,
Did you  create a common interface  node in shared component( component with  IF_FPM_SHARED_DATA interface )  and made use of it in other two components.
It seems like you have created similar nodes in the components.Please try creating a interface node in shared component and utilize it in other two by context mapping.
Thank You,
Harsha