ERROR LOADING WSDL....

Dear All

We are trying to create a scanario which involves:

Webservices <--

> WebServices

On the Sender and Receiver side we are using SOAP adapter

Source Sytem is WEBSERVICES and target system is EP ( WEBSERVICES).The target system(EP) is asking for a URL.

I getting the following error when i try to call the webservice into GP.

_Could not load WSDL: GenericServiceFactory initialization problem when trying to load Web service model for WSDL: http://ssisrp7r:50000/sap/xi/engine?type=entry_

I have tried using the Source Sytem URL as well as PI URL and in both the cases I am getiing the same error.

One more Question:

Which URL we need to use for EP...

1) The source system URL or PI URL.....??

Kindly help

Regards

Azahar