Rule Definition
If possible, avoid raising an exception in a supply function or in a method called by a supply function. Since supply functions are often called during rendering, these exceptions cannot be processed efficiently. This can impact the error handling and the performance of the component.

Remediation
Since runtime controls when the supply function is called (and not the code created by the application developer), it is especially important that no errors occur when the data is retrieved. For this reason, use the supply function only if you know that the data is available and correct in the back end.

Violation Code Sample

method BOOKINGS_READ .

  data:
    Stru_flight             type IF_COMPONENTCONTROLLER=>Element_Flightinfo,
    Itab_Booking            type IF_COMPONENTCONTROLLER=>Elements_Bookingtab.

* Get Parent Element
CALL METHOD parent_element->get_static_attributes
  IMPORTING
    STATIC_ATTRIBUTES = Stru_flight.

* read bookings
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.

if sy-subrc NE 0.
  RAISE NO_DATA_FOUND.
else.
* bind all the elements
  Node->Bind_Table(
    New_Items =  Itab_Booking
    Set_Initial_Elements = Abap_True ).
endif.
endmethod.

Fixed Code Sample

method BOOKINGS_READ .

  data:
    Stru_flight             type IF_COMPONENTCONTROLLER=>Element_Flightinfo,
    Itab_Booking            type IF_COMPONENTCONTROLLER=>Elements_Bookingtab.

* Get Parent Element
CALL METHOD parent_element->get_static_attributes
  IMPORTING
    STATIC_ATTRIBUTES = Stru_flight.

* read bookings
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.

if sy-subrc = 0.
* bind all the elements
  Node->Bind_Table(
    New_Items =  Itab_Booking
    Set_Initial_Elements = Abap_True ).
endif.
endmethod.

NetWeaver Web Dynpro for Abap http://help.sap.com/saphelp_nw2004s/helpdata/en/f1/177741adb7167de10000000a155106/frameset.htm