An EJB relation describes a relationship between two entity beans with container-managed persistence.
The name of the relationship, if specified, is unique within an EJB archive file.
Cascade delete can be specified only for an EJB relationship role contained in an EJB relation in which the other EJB relationship role specifies a multiplicity of one.
The CMR field describes the bean provider's view of a relationship. It consists of an optional description and the name and class type of the source enterprise bean's role in a relationship.