// The parent classes
@Entity
@Table(name="t_holiday")
public class Holiday implements Serializable {
   private static final long serialVersionUID = -3948723008730842068L;
   
   @Id
   @GeneratedValue(strategy=GenerationType.AUTO)
   private Long id;
   
   @OneToMany(cascade=CascadeType.ALL)
   @Cascade(value={org.hibernate.annotations.CascadeType.DELETE_ORPHAN})
   @JoinColumn(name="item_id", nullable=false)
   private Set<Translation> names;
        ...
}

@Entity
@Table(name="t_request_type")
public class RequestType implements Serializable {
   private static final long serialVersionUID = -5099401234648927543L;
   
   @Id
   @GeneratedValue(strategy=GenerationType.AUTO)
   private Long id;
   
   @OneToMany(cascade=CascadeType.ALL)
   @Cascade(value={org.hibernate.annotations.CascadeType.DELETE_ORPHAN})
   @JoinColumn(name="item_id", nullable=false)
   private Set<Translation> names;
   
   @OneToMany(cascade=CascadeType.ALL)
   @Cascade(value={org.hibernate.annotations.CascadeType.DELETE_ORPHAN})
   @JoinColumn(name="item_id", nullable=false)
   private Set<Translation> descriptions;
        // getters and setters omitted
}

// the child class
@Entity
@Table(name="t_translations")
public class Translation implements Serializable {
   private static final long serialVersionUID = -6518609736903575223L;

   @Id
   @GeneratedValue(strategy=GenerationType.AUTO)
   private Long id;
   
   @Column(name="locale", nullable=false)
   private String locale;
   private String description;
   
   @Enumerated(EnumType.STRING)
   private TranslationCategory category;
        // getters and setters ommitted
}

org.hibernate.MappingException: Duplicate property mapping of _namesBackref found in be.xplore.verlof.model.Translation
   at org.hibernate.mapping.PersistentClass.checkPropertyDuplication(PersistentClass.java:477)
   at org.hibernate.mapping.PersistentClass.validate(PersistentClass.java:467)
   at org.hibernate.mapping.RootClass.validate(RootClass.java:215)
   at org.hibernate.cfg.Configuration.validate(Configuration.java:1135)
   at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1320)
   at org.hibernate.cfg.AnnotationConfiguration.buildSessionFactory(AnnotationConfiguration.java:867)
   at org.springframework.orm.hibernate3.LocalSessionFactoryBean.newSessionFactory(LocalSessionFactoryBean.java:816)
   at org.springframework.orm.hibernate3.LocalSessionFactoryBean.buildSessionFactory(LocalSessionFactoryBean.java:734)
   at org.springframework.orm.hibernate3.AbstractSessionFactoryBean.afterPropertiesSet(AbstractSessionFactoryBean.java:211)
   at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1333)
   at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1299)
   ... 120 more

@ManyToAny(
            metaColumn = @Column( name = "property_type" ) )
    @AnyMetaDef(
        idType = "integer",
        metaType = "string",
        metaValues = {
            @MetaValue( value = "S", targetEntity = StringProperty.class ),
            @MetaValue( value = "I", targetEntity = IntegerProperty.class ) } )
    @Cascade( { org.hibernate.annotations.CascadeType.ALL } )
    @JoinTable( name = "obj_properties", joinColumns = @JoinColumn( name = "obj_id" ),
            inverseJoinColumns = @JoinColumn( name = "property_id" ) )
    public List<Property> getGeneralProperties() {