[Attribute] RelationshipType [Type] RelationshipType [Description] Indicates whether the user is asserting that the data related to by this association meets the criteria of one-to-one data or fits the more general case of one-to-many. For one-to-one, the user is asserting that for every row on the primary-key ("one") side, there is only one row on the foreign-key ("many") side. This will cause an EntityRef to be generated on the "one" side instead of an EntitySet. The valid values are OneToOne and OneToMany. [Default] 
OneToMany