if (! registration.hasAssociatedTutor()) { return new String("error.enrollment.notStudentTutor+" + registration.getNumber().toString()); }  return null; }
final Registration registration = readStudent(arguments); if (registration == null) { return "noAuthorization"; }  if (registration.getAssociatedTutor() == null) { return new String("error.enrollment.notStudentTutor+" + registration.getNumber().toString()); }  return null; }
	protected String checkTeacherInformation(IUserView userView, Object[] arguments) {				final Teacher teacher = readTeacher(userView);		if (teacher == null) {		    return "noAuthorization";		}		final Registration registration = readStudent(arguments);		if (registration == null) {		    return "noAuthorization";		}		if (! registration.hasAssociatedTutor()) {		    return new String("error.enrollment.notStudentTutor+"		            + registration.getNumber().toString());		}				return null;	}