You can create a bidirectional association with two sides to allow the navigation, management and usage of query operations for this association from both sides of the associated business objects.
You can change the type of the association to be child-parent associations between business objects. If the parent business object node is deleted, the child business object node is deleted as well. You can create cross-business object associations. If you delete the source business object, the target business object node of the association is not deleted.
Defining Business Object Associations