if (attend.hasEnrolment()) { throw new DomainException("errors.student.already.enroled"); }
if (attend.hasEnrolment()) { throw new DomainException("errors.student.already.enroled");
	private void checkIfHasEnrolmentFor(final Attends attend) {		if (attend.hasEnrolment()) {			throw new DomainException("errors.student.already.enroled");		}	}