You can define a relationship between mobile business objects.
For example, you could have two mobile business objects, SalesOrder and Customer. An instance of a SalesOrder might have a link, or relationship, to an instance of Customer who created the SalesOrder. A Customer might have a link for a number of SalesOrder that the Customer created.
Each mobile business object can have one or more relationships. Relationships are graphically displayed in the mobile application diagram as lines, which connect one mobile business object to another.