| Code | Description | Comment | Version |
| EQV | Equivalence Override | Identifies an override where a service is being performed against an order that the system does not recognize as equivalent to the ordered service. | added v2.5 |
| EXTN | Extension Override | Identifies an override where a service is being performed for longer than the ordered period of time. | added v2.5 |
| INLV | Interval Override | Identifies an override where a repetition of service is being performed sooner than the ordered frequency. | added v2.5 |