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Entity relationship eligibility

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Before you create an entity relationship you should confirm whether the entity is eligible to participate in the relationship. The following table lists the messages that you can use to determine whether entities can participate in entity relationships.

Message Web API Operation SDK Assembly
CanBeReferenced
Checks whether the specified entity can be the primary entity (one) in a one-to-many relationship.		 CanBeReferenced Action CanBeReferencedRequest
CanBeReferencing
Checks whether the specified entity can be the referencing entity (many) in a one-to-many relationship.		 CanBeReferencing Action CanBeReferencingRequest
CanManyToMany
Checks whether the entity can participate in a many-to-many relationship.		 CanManyToMany Action CanManyToManyRequest
GetValidManyToMany
Returns the set of entities that can participate in a many-to-many relationship.		 GetValidManyToMany Function GetValidManyToManyRequest
GetValidReferencedEntities
Returns the set of entities that are valid as the primary entity (one) from the specified entity in a one-to-many relationship.		 GetValidReferencedEntities Function GetValidReferencedEntitiesRequest
GetValidReferencingEntities
Returns the set of entities that are valid as the related entity (many) to the specified entity in a one-to-many relationship.		 GetValidReferencingEntities Function GetValidReferencingEntitiesRequest

See also

Customize Entity Relationship Metadata
Extend the Metadata Model for Dynamics 365 Customer Engagement (on-premises)
Entity Relationship Metadata
Entity Relationship Messages
Entity Relationship Behavior
Create one-to-many or many-to-one entity relationships overview