Use the Project/Folder View page to export a WSDL associated with a proxy service or a business. The WSDL is exported as a JAR file. You can export a WSDL only when you are outside a session. See Using the Change Center.
Use the Export WSDL feature to make a WSDL available for consumption by external tools such as IDEs. Note that this is different than the Export Resources feature in the System Administration module, which you use to move and stage resources between two domains.