The Owns Destination option lets you specify whether the relationship’s source owns its destination objects. When a source object owns its destination object, for example, as when an Agent object owns its Customer objects, when a destination object (Customer) is removed from the relationship, it is also removed from the data source. Ownership implies that an owned object cannot exist without its owner.
The Propagate Primary Key option lets you specify that the primary key of the source entity should be propagated to newly inserted objects in the destination of the relationship. That is, when inserting objects that are the destination of the relationship, this option suppresses primary key generation for the destination entity and instead uses the source object’s primary key as the primary key for the newly inserted destination object.
This option is used for an owning relationship where the owned object has the same primary key as the source. Propagating primary key confers a performance improvement as it doesn’t require the generation of a primary key for the destination entity. Primary key propagation is also commonly used to generate primary keys for join tables in many-to-many relationships.