When you create outside-in Web services, you use a WSDL document as a basis.
Before you can create an outside-in Web service, you have to import the WSDL document you want to use as a basis.
Importing WSDL Documents in the SAP NetWeaver Developer Studio
This procedure enables you to generate a Java bean skeleton based on a WSDL document you have imported in the SAP NetWeaver Developer Studio
More Information
Browsing Enterprise Services from the SAP NetWeaver Developer Studio