org.grails.core.exceptions.GrailsRuntimeException: Target of [unique] constraints [composite.id.unique.UniqueWithCompositeId : (unsaved)] is not a domain instance. Unique constraint can only be applied to domain classes and not custom user types or embedded instances

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Domain class fails to save when defining a composite ID and a multi-column unique constraint

Target of [unique] constraints [composite.id.unique.UniqueWithCompositeId : (unsaved)] is not a domain instance. Unique constraint can only be applied to domain classes and not custom user types or embedded instances

org.grails.core.exceptions.GrailsRuntimeException: Target of [unique] constraints [composite.id.unique.UniqueWithCompositeId : (unsaved)] is not a domain instance. Unique constraint can only be applied to domain classes and not custom user types or embedded instances	at org.grails.orm.hibernate.validation.UniqueConstraint.processValidate(UniqueConstraint.java:142)	at grails.validation.AbstractConstraint.validate(AbstractConstraint.java:107)	at grails.validation.ConstrainedProperty.validate(ConstrainedProperty.java:979)	at org.grails.validation.GrailsDomainClassValidator.validatePropertyWithConstraint(GrailsDomainClassValidator.java:211)	at org.grails.validation.GrailsDomainClassValidator.validate(GrailsDomainClassValidator.java:81)	at org.grails.orm.hibernate.AbstractHibernateGormInstanceApi.save(AbstractHibernateGormInstanceApi.groovy:122)	at org.grails.datastore.gorm.GormEntity$Trait$Helper.save(GormEntity.groovy:151)