EDIT

                    Set<SpecimenOrObservationBase> nextSobs = null;

                    for(@SuppressWarnings("rawtypes") SpecimenOrObservationBase sob : sobs){

                        sob = HibernateProxyHelper.deproxy(sob);

                        if(DerivedUnit.class.isAssignableFrom(sob.getClass())) {

                            defaultBeanInitializer.initialize(sob, DERIVEDUNIT_INIT_STRATEGY);

                            nextSobs = ((DerivedUnit)sob).getOriginals();