This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori on-line! See this thread for details.
From the EJB 2.1 specification, section 9.3 states:
Entity beans that have container-managed relationships with other entity beans, as described in Chapter 10, �Entity Bean Component Contract for Container-Managed Persistence�, must be accessed in the same local scope as those related beans, and therefore typically provide a local client view. In order to be the target of a container-managed relationship, an entity bean with container-managed persistence must provide a local interface.
While it is possible to provide both a client view and a local client view for an entity bean with container-managed persistence, it is more likely that the entity bean will be designed with the local view in mind.