stendler ( https://hibernate.atlassian.net/secure/ViewProfile.jspa?accountId=5b83900... ) *commented* on HHH-12930 ( https://hibernate.atlassian.net/browse/HHH-12930?atlOrigin=eyJpIjoiOWZmM2... ) Re: non-primary embedded composite @ManyToOne mapping fails -> AnnotationException: referencedColumnNames ... not mapped to a single property ( https://hibernate.atlassian.net/browse/HHH-12930?atlOrigin=eyJpIjoiOWZmM2... ) It’s been a while, but, if I recall correctly, the example is missing/assumes a different attribute being the primary key. E.g.: @Id private int id; With that, the @NaturalId cannot be an @EmbeddedId. Though, it should still be possible to map entities using a (non-primary) embedded composite natural key. I’ve reconstructed a test case using the template ( https://github.com/hibernate/hibernate-test-case-templates/tree/main/orm/... ). The @ManyToOne -Mapping actually does work with the NaturalId, if it is not an embeddable and its composite attributes are direct attributes of the Region-Entity instead (corresponding working code included as comments). hhh-12930-hibernate-orm-6.zip ( https://hibernate.atlassian.net/secure/attachment/50086/50086_hhh-12930-h... ) ( https://hibernate.atlassian.net/browse/HHH-12930#add-comment?atlOrigin=ey... ) Add Comment ( https://hibernate.atlassian.net/browse/HHH-12930#add-comment?atlOrigin=ey... ) Get Jira notifications on your phone! Download the Jira Cloud app for Android ( https://play.google.com/store/apps/details?id=com.atlassian.android.jira.... ) or iOS ( https://itunes.apple.com/app/apple-store/id1006972087?pt=696495&ct=Em... ) This message was sent by Atlassian Jira (v1001.0.0-SNAPSHOT#100209- sha1:6031644 )