The different entities in a model reference each other, and input data must thus be entered in the correct order. This list show the correct order and dependencies. Entities with a higher indentation depend on entities with less indentation.
Start populating the entities at the top of the list and work your way down.
Note that it is pretty straightforward to extend the data model to match your own domain model. During an implementation additional data types can be added that map more accurately to your business and/or data sources.