Class Parent {

   ...

   @Override
   @OneToMany(targetEntity = ClassVersion.class, mappedBy = "parent", cascade = { PERSIST, REMOVE })
   @OrderBy("versionNum")
   public List<Child> getVersions() {
	return super.getVersions();
   }
}

Class Child {

   ...

   @Override
   @ManyToOne(targetEntity = Parent.class, optional = false)
   @JoinColumn(name = "parent_id", referencedColumnName = "uuid", updatable = false, nullable = false)
   public Parent getParent() {
	return (Parent) super.getParent();
   }
}