The Web Dynpro model retrieves the application data from the back-end system. If you have to use several models, every model must be assigned to one Web Dynpro component.
The data for a Web Dynpro application can originate from different sources. You can
· Call and use SAP data from a SAP back-end system using BAPIs
· Define new data
· Call and use Web services
· Combine the three above procedures
· Import an external model using the appropriate tools