Creating web service for bapi and consume in portal.

Hi ,
I am new to Web Services. This is my requirement I need to publish the functionality of bapi as a web service and consume the web service from portal side.
I have followed these steps to create web service.In transaction se80 i have created service definiton and a wsdl file is generated.
When i am exporting that WSDL file and creating a model in a webdynpro project. I am getting the following error. I dont know how to proceed further.Error while loading WSDL.Check error log for more details.
Whether the proxies need to be generated?What is the purpose of it? Where the proxies need to be generated?
Is Process integration needed to use web services?
Kindly guide me how to proceed.
Best Wishes
Idhaya R

the proxy is the object that make possible to use the service; even if service and consumer are on the same host, you need a proxy to use it.
try to check this blog
/people/thomas.jung/blog/2007/12/17/consuming-services-with-abap

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