EDIT

    @Override

    @Transactional(readOnly=false)

    public void addTypeDesignation(Registration registration, UUID typeDesignationUuid){

        if(registration == null){

            registration = newRegistration();

            registration = assureIsPersisted(registration);

        } else {

            if(registration.isPersited()){

                // make sure the the typeDesignations are loaded with the registration so that typified names can not be twice in detached sessions

                // otherwise multiple representation problems might occur

                registration.getTypeDesignations();

            }

        }

        TypeDesignationBase<?> nameTypeDesignation = nameService.loadTypeDesignation(typeDesignationUuid, Arrays.asList(""));

        registration.getTypeDesignations().add(nameTypeDesignation);

    }