1. Drag the Data Entity shape from the Document Stencil onto the model diagram.
The Create Data Entity dialog will be displayed:
2. Enter an Entity name of Customer.
Do not specify a physical file name for the entity at this stage.
3. Click the OK button.
The shape you dropped onto the diagram will be updated and will appear something like this:
4. Note the inverted red triangle to the top-right of the shape. Whenever you see this triangle, it means that the entity has error messages.
5. Right-click the Customer entity and choose the Error messages… option from the pop-up menu. The following dialog will be displayed:
Note that dynamic validation of the entity has taken place; you do not have to wait until you build your model in order to see errors that will prevent it from being built.
From time to time in the remaining tutorials, when you see the red triangle, use the Error messages… option to see some of the different errors that are generated for an entity.