Sandman Error  for composite primary keys

Hi Guys 

I seem to get the following error when calling sandman 

sqlalchemy.exc.InvalidRequestError: Incorrect number of values in identifier to formulate primary key for query.get(); primary key columns are 'abpi_orders.order_id','abpi_orders.customer_id','abpi_orders.order_status_id'

My table seems to have composite primary keys ? Are these supported by sandman ?
