|check|''account owing for''| Bob |''is''|0.00|

|''begin transaction for client''| Bob |''staff''| Bill |
|''rent''|1||Tricycle|''for''|1 day|
|''pay on account $''|20.00|
|''cancel transaction''|

|''rental item subset''|
|''name''|''free count''|
|Tricycle|1|

|check|''account owing for''| Bob |''is''|0.00|