Problem of Creating a web dynpro application based on a car rental web serv

Based original SAP developer studio examples shipped with the developer studio, I first create J2EE application “QuickCarRental”. It works at http://192.168.254.4:50300/QuickCarRental.
A web service “QuickCarRentalWebService” is defined in J2EE application “QuickCarRental”. My web dynpro application “TutWD_CarRental” is web service consumer invoking “QuickCarRentalWebService”.
When I deploy “TutWD_CarRental” on SAP J2EE engine and  run the application at http://192.168.254.4:50300/webdynpro/dispatcher/local/TutWD_CarRental/CarRentalApp, i can see the web dynpro web application interface right.
however, I get the following error when I input some data and Click button rent a car.
Service call exception; nested exception is: com.sap.engine.services.webservices.jaxrpc.exceptions.InvalidResponseCodeException: Invalid Response Code: (404) Not Found.
when i click Display all bookings, the error is:
Service call exception; nested exception is: com.sap.engine.services.webservices.jaxrpc.exceptions.InvalidResponseCodeException: Invalid Response Code: (404) Not Found.
I install SAP developer studio on my winXP desktop, and the SAP developer studio version is 2.0.10.
I have my SAP Web application server and J2EE engine Version 6.40 run on a different machine. the SAP server IP address is 192.168.254.4
could anybody give me some clue on this. is that because i miss some configurations on SAP server for enabling web services of “QuickCarRentalWebService”?
Thanks!
Thomas

HI
Find here.
https://www.sdn.sap.com/irj/sdn/downloaditem?rid=/library/uuid/9fc0e990-0201-0010-199c-e38fc6dafb5d
Thanks
Lohi.

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