Creating an Application Service 
Application services contain the business logic of your application. You can also use application services to present data to the user interface.
You have opened the Composite Application perspective in SAP NetWeaver Developer Studio.
Open the carpool application in the SAP NetWeaver Developer Studio.
In the Composite Application Explorer view, click modeled package with the secondary mouse button and choose .
In the Application Service Namefield, enter TravelLocationApp and choose Finish.
In the Composite Application Explorer view, double-click the TravelLocationApp service and open the Dependenc ies tab page.
From the Existing Objectstree, navigate to and choose with the quick info text Add Dependency.
The new object appears under the Dependent Objects list.
You have created your first application service and it appears in the Composite Application Explorerview.