Qualifying, Leading, and Referencing Entities
A standard or custom entity made be added as a standard, leading, or qualifying entity. The process for each is similar. RDG restricts the addition of these entities to valid places in the data model tree. For example, a qualifying entity may only be added to a custom type 4 entity. A referencing entity may be added to either a type 1 or a type 4 entity. A leading relationship can be created between a custom type 1 entity and another custom or standard type 1 entity. RDG guides the user through the requirements to add each kind of relationship.