/** @see org.olat.course.nodes.CourseNode#cleanupOnDelete(org.olat.course.ICourse) */
 @Override
 public void cleanupOnDelete(final ICourse course) {
   final CoursePropertyManager pm = course.getCourseEnvironment().getCoursePropertyManager();
   // Delete all properties: score, passed, log, comment, coach_comment
   pm.deleteNodeProperties(this, null);
 }