Create a partial business process level rea model with multiplicities.

Purchase orders for inventory may be placed by any one of ABC Company's five buyers, with approved vendors. Buyers are added to the database as soon as they are hired. Also, potential vendors are added to the database as soon as they are recognized as a potential vendor. Purchase orders are often placed with a vendor for multiple inventory items, while at the same time, most inventory items may be purchased from a selection of approved vendors.