UniqueConstraint in a MappedSuperclass not working

[depstei2]

Hello, I think this is a bug:

I am getting 
Caused by: <openjpa-1.2.1-r752877:753278 nonfatal user error> 
org.apache.openjpa.persistence.ArgumentException: The column "ATTR_NAME" in a 
unique constraint in "foo.bar.Attribute" on table "null" can not be found in 
the list of available columns "[]".
        at 
org.apache.openjpa.jdbc.meta.ClassMappingInfo.getUniques(ClassMappingInfo.java:432)
        at 
org.apache.openjpa.jdbc.meta.ClassMapping.resolveMapping(ClassMapping.java:857)
        at 
org.apache.openjpa.meta.ClassMetaData.resolve(ClassMetaData.java:1631)
        at 
org.apache.openjpa.meta.MetaDataRepository.processBuffer(MetaDataRepository.java:717)
        at 
org.apache.openjpa.meta.MetaDataRepository.resolveMapping(MetaDataRepository.java:677)
        at 
org.apache.openjpa.meta.MetaDataRepository.resolve(MetaDataRepository.java:555)
        at 
org.apache.openjpa.meta.MetaDataRepository.getMetaData(MetaDataRepository.java:308)
        at 
org.apache.openjpa.meta.MetaDataRepository.resolveMeta(MetaDataRepository.java:581)
        at 
org.apache.openjpa.meta.MetaDataRepository.resolve(MetaDataRepository.java:541)
        at 
org.apache.openjpa.meta.MetaDataRepository.getMetaData(MetaDataRepository.java:308)
        at 
org.apache.openjpa.jdbc.meta.MappingRepository.getMapping(MappingRepository.java:285)
        at 
org.apache.openjpa.jdbc.meta.MappingTool.getMapping(MappingTool.java:676)
        at 
org.apache.openjpa.jdbc.meta.MappingTool.buildSchema(MappingTool.java:748)
        at org.apache.openjpa.jdbc.meta.MappingTool.run(MappingTool.java:646)
        at 
org.apache.openjpa.jdbc.kernel.JDBCBrokerFactory.synchronizeMappings(JDBCBrokerFactory.java:153)
        at 
org.apache.openjpa.jdbc.kernel.JDBCBrokerFactory.newBrokerImpl(JDBCBrokerFactory.java:119)
        at 
org.apache.openjpa.kernel.AbstractBrokerFactory.newBroker(AbstractBrokerFactory.java:189)
        at 
org.apache.openjpa.kernel.DelegatingBrokerFactory.newBroker(DelegatingBrokerFactory.java:142)
        at 
org.apache.openjpa.persistence.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:192)
        at 
org.apache.openjpa.persistence.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:145)

I have a class
@MappedSuperclass
@Table(uniqueconstraint...@uniqueconstraint(columnNames={"ATTR_NAME", 
"OWNER"})})
public abstract class Attribute<T> {
        @Id
        private String id;

        @Column(name="ATTR_NAME")
        private String name;
        
        @Column(name="ATTR_VALUE")
        private String value;

        public abstract T getOwner();
        public abstract void setOwner(T owner);

and it is extended by
@Entity
@Table(name = "ORG_ATTR")
public class OrgAttribute extends Attribute<Org> {
        @ManyToOne
        @JoinColumn(name = "OWNER")
        private Org owner;

        @Override
        public Org getOwner() {
                return owner;
        }

        @Override
        public void setOwner(Org owner) {
                this.owner = owner;
        }
}

This mapping is working in both Eclipselink and Hibernate
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