IdentifyingAttributes Collection (Model Designer)
Contains references to the attribute used to identify an instance of the entity to the user.
Provides references to the attribute used to identify the entity to the user. Cannot refer to an attribute of type Binary.
Identifying attributes are used for displaying instances in drop-down lists and in the Filter List dialog box in Report Builder. When selecting instances of an entity, the user sees a concatenated value comprised of all the identifying attributes.
An entity generally should have very few attributes, preferably only one, assigned to the IdentifyingAttributes collection. Consider adding more than one attribute to the IdentifyingAttributes collection when an entity will display instances in the Filter List dialog box so that users can more easily identify the instance. For example, you might include both the Name and ID fields in the collection. However, when you add more than one field to the collection, you will not be able to secure these fields independently using model item security.