|''begin transaction for client''| Bob |''staff''| Bill |
|''rent''|1||Truck|''for''|1 day|
 * Actions

|''begin transaction for client''| Joanna |''staff''| Bill |
|'''reject'''|''book''|1||Truck|''on''|2004/05/06 11:01|''for''|2 days|
|''complete transaction''|

|''resume transaction for client''| Bob|
|''pay with cash $''|2000.00|
|''complete transaction''|
 * Checks
|''rentals of client''|Bob|
|''rental item''|''count''|''start date''|''end date''|
|Truck|1|2004/05/06 09:01|2004/05/07 09:01|

|''rental item subset''|
|''name''|''free count''|
|Truck|0|