@Entity
@Table(name = "AttributeGroup")
public class AttributeGroup extends AbstractEditableObject
{
   ...
   @Any(metaColumn = @Column(name = "ownerType"), fetch = FetchType.LAZY)
   @AnyMetaDef(idType = "string", metaType = "string", metaValues =
      {
            @MetaValue(value = "InventoryClass", targetEntity = InventoryClass.class),
            @MetaValue(value = "InventorySubClass", targetEntity = InventorySubClass.class),
            @MetaValue(value = "AdhocMaterialGroup", targetEntity = AdhocMaterialGroup.class)
      }
   )
   @JoinColumn(name = "ownerId")
   private AttributeGroupOwner owner;
...
}

@Entity
@Table(name = "AdhocMaterialGroup")
public class AdhocMaterialGroup extends AbstractEditableObject implements AttributeGroupOwner
{
...
   @OneToMany(fetch = FetchType.EAGER,  targetEntity = AttributeGroup.class, mappedBy = "owner")
   private Set<AttributeGroup> attributeGroups = new HashSet<AttributeGroup>(0);
...
}

@MappedSuperclass
public abstract class AbstractEditableObject implements EditableObject
{   ...
   @Id
   @GenericGenerator(name = "guid", strategy = "guid")
   @GeneratedValue(generator = "guid")
   @Column(name = "id", unique = true, nullable = false, updatable = false, columnDefinition = "uniqueidentifier")
   private String id;
   ...
}

public interface AttributeGroupOwner
{

   public Set<AttributeGroup> getAttributeGroups();

   public void setAttributeGroups(Set<AttributeGroup> attributeGroups);
}