} else { return null;
	public RoomClassification getParentRoomClassification() {	    final int index = getCode().lastIndexOf('.', getCode().length());	    if (index > 0) {		final String parentAbsoluteCode = getCode().substring(0, index);		final RoomClassification roomClassification = findRoomClassificationByPresentationCode(parentAbsoluteCode);		if (roomClassification == null) {		    throw new DomainException("error.unexisting.room.classification");		} else {		    return roomClassification;		}	    } else {		return null;	    }	}