Model element name completion
- Double click Purchase Book from the Diagram Navigator
- Select Class from the diagram toolbar and drag it on the diagram pane
- Type Book in the name of the newly created and select Book - model from the drop-down menu
- Move the mouse on Transaction class, press its resource icon Association -> Class and drag it to Book class for linking
- Rename the Book class as Publication
- When return Domain Model, the class's name has been changed into Publication