This is from the Sakila-H2 model.

In the create stores screen, we have new Staff that can be added to a store, as well as a manager (another Staff) that can be assigned to a store. The manager to be assigned to the store is not nullable (and is required to be provided when creating/editing a store; see FORGE-999). When no Staff has been created yet, the list of staff that can be assigned as a manager is empty, thus making it impossible to create a new Store without modifying the scaffold.

This could be improved by allowing new Staff to be created in the Create Stores screen, and allowing the newly created but un-persisted Staff to be assigned as Managers to the Store.