Relationship Type

Use this option to specify the type of relationship the selected business object has with the object being edited. The relationship can be:

None	There is no relationship between the objects.
Loosely coupled peer	This business object can be displayed in the same instance list as the object being edited even though there is no hierarchical relationship between them.
Child or descendant	This object is a child object of the object being edited.

This property is in the Business Object Instance List/Relations tab.