Maintains a relationship between two entity base objects. Use relationship base objects to establish a many-to-many relationship.

A foreign key base object is an entity base object with a foreign key column. Use foreign key base objects to establish a 1-to-1 or 1-to-many relationship. For example, many products might relate to a single product group. An entity base object can have more than one foreign key column. Each foreign key column maintains a relationship.