private void checkIfCanCreateExternalEnrolment(
final Registration registration, final ExternalCurricularCourse externalCurricularCourse) {
for (final ExternalEnrolment externalEnrolment : registration.getExternalEnrolmentsSet()) {
if (externalEnrolment.getExternalCurricularCourse() == externalCurricularCourse) {
throw new DomainException(
"error.studentCurriculum.ExternalEnrolment.already.exists.externalEnrolment.for.externalCurricularCourse",
externalCurricularCourse.getName());
}
}
}
