docs: public NotificationChain basicSetStart(Parameter newStart, NotificationChain msgs) {
  		Parameter oldStart = start;
  		start = newStart;
  		if (eNotificationRequired()) {
  			ENotificationImpl notification = new ENotificationImpl(this, Notification.SET, BpsimPackage.SCENARIO_PARAMETERS__START, oldStart, newStart);
  			if (msgs == null) msgs = notification; else msgs.add(notification);
  		}
  		return msgs;
  	}