The following procedure shows how to define foreign keys to link entities created in Creating business entities in the data model in the Movie data model.
In the Data Model Entities panel, right-click the element you want to set as a foreign key and select Set the Foreign Key from the contextual menu.
In this example, right-click the Director attribute from the Movie entity.
Note that a Foreign Key must always be a string.
The [Set the Foreign Key] dialog box pops up.
Click the [...] button to open the [Select Xpath] dialog box.
Browse to the Director attribute Id and then click Add in the bottom of the dialog box.
The Xpath to the foreign key is displayed in the [Set the Foreign Key] dialog box.
Click OK to finish setting the foreign key.
The foreign key is set to Director/Id under the Annotations node of the Director attribute in the Movie entity.
Follow the same steps to set the Movie attribute in the Customer entity as a foreign key which points to the Movie entity.
In the Movie data model, the foreign keys are added to link entities in the data model.