A relation item in a model describes the relationships between entities. You can modify the properties of an existing relation within a model.

To modify a relation

1. In the Models list, select the model that you want to edit and then click Edit model button.
   

2. In the model editor that appears, in the Entities list on the left, select the entity whose relation you want to modify. The properties appear in the workspace and the Attributes and Relations lists populate with any associated attributes and relations.
3. In the Relations list on the lower right, select the relation whose properties you want to modify. The properties appear in the workspace.
4. In the workspace, change properties as necessary. The table below gives details about the properties.

   Relation properties

   Property Name	Type	Description
   (Id)	ID	A unique identifier for the relation. Used internally by the system.
   Name	String	The name for the relation.
   Binding	ID	The database object that the relation represents.
   Cardinality	Enum	Defines the rules and restrictions for the relation's behavior in the entity tree and in semantic query building. Possible values are One, Many, OptionalOne, or OptionalMany. This property determines whether the Recursive property has an effect on the relation.
   Description	String	A description of the relation that appears as tooltip text in the Report Portal when a user hovers the pointer over the relation.
   Hidden	Boolean	Indicates whether the entity reached by the relation is hidden from end users.
   Recursive	Boolean	Indicates whether the relation can be added more than once to the same path. This applies only to relations with a Cardinality of One or OptionalOne. For relations with a Cardinality of Many or OptionalMany, this property is ignored.
   Include self	Boolean	Indicates whether to allow the relation to be accessible to itself in the same recurring path. This applies only in the second level of an entity.
   HiddenFields	Object	Defines the set of entity fields that is hidden from end users when they reach the entity through the relation.
   RelatedRelation	Object	Indicates the backward relation (the relation for the related entity) of the relation. You cannot edit this value, but you can use the navigate link to go to the related relation.
   RelatedEntity	Object	The entity to which the relation is bound. You cannot edit this value, but you can use the navigate link to go to the related entity.