How to use a web-service

If you want to use an existing web service exposed by some web site then you need to do the following:

Define an intelligent business object representing the web site exposing the web service with System intelligence type – see the “Defining Intelligent Business Objects” section.
Define the SOAP channel as the default channel for this object. Specify the URL where the WDSL file describing the web service is exposed as the property of the channel – see the “Setting Properties of SOAP Channel” section (alternatively ask the web service provider for the WSDL file, copy this file to a local file system and specify the URL to this, file, for example: file://c:/temp/lookup.wsidl).
Discover services of the business object – see the “Discovering Services” section. The web service you want to use should appear in the list of services exposed by the object.
Define a rule that will request the service of the business object using the REQUEST SERVICE action.