EDIT

            }

            //check if unit already exists

            DerivedUnitFacade derivedUnitFacade = null;

                SpecimenOrObservationBase<?> existingSpecimen = findExistingSpecimen(state.getDataHolder().getUnitID(), state);

                if(existingSpecimen!=null && existingSpecimen.isInstanceOf(DerivedUnit.class)){

                    DerivedUnit derivedUnit = HibernateProxyHelper.deproxy(existingSpecimen, DerivedUnit.class);