Prepare a data dictionary describing all classes identified.
| Class Data Dictionary | |
| Class name | purchase order |
| Description | A legal document issued by the company stating the request to purchase goods or services from a supplier. |
| Aliases | PO, order |
| Class scope | Must be created for all company purchases. |
| Assumptions/restrictions on membership and use | Is not valid unless authorised by the purchasing manager. |
| Associations | Is placed on a vendor |
| Attributes | Must be associated with a single vendor. Must have a unique order number. Must have one but may have many line items. |
| Operations | Is created, expedited, filled and
archived. May be canceled or amended. |