code: @Override
  	public CommerceOrder fetchByG_U_O_Last(long groupId, long userId,
  		int orderStatus, OrderByComparator<CommerceOrder> orderByComparator) {
  		int count = countByG_U_O(groupId, userId, orderStatus);
  
  		if (count == 0) {
  			return null;
  		}
  
  		List<CommerceOrder> list = findByG_U_O(groupId, userId, orderStatus,
  				count - 1, count, orderByComparator);
  
  		if (!list.isEmpty()) {
  			return list.get(0);
  		}
  
  		return null;
  	}
docs: Returns the last commerce order in the ordered set where groupId = &#63; and userId = &#63; and orderStatus = &#63;.
  
  @param groupId the group ID
  @param userId the user ID
  @param orderStatus the order status
  @param orderByComparator the comparator to order the set by (optionally <code>null</code>)
  @return the last matching commerce order, or <code>null</code> if a matching commerce order could not be found