| 400 | EXTPNO-OFFERS-0001 | Required fields are missing |
| 400 | EXTPNO-OFFERS-0002 | Request input validation failed |
| 400 | EXTPNO-OFFERS-CPOPOFFER-0005 | Request failed with unknown error |
| 400 | EXTPNO-OFFERS-CPOPOFFER-0006 | Unsupported Flow |
| 400 | EXTPNO-ORDER-ACTION-VALIDATE-CPOPPRICING-0001 | Required fields are missing |
| 400 | EXTPNO-ORDER-ACTION-VALIDATE-CPOPPRICING-0002 | Request input validation failed |
| 400 | EXTPNO-ORDER-ACTION-VALIDATE-CPOPPRICING-0003 | The requested action cannot be completed |
| 400 | EXTPNO-ORDER-ACTION-VALIDATE-CPOPPRICING-0004 | Reason code not allowed for action |
| 400 | EXTPNO-ORDER-ACTION-VALIDATE-CPOPPRICING-0005 | The account cannot be qualified for change rate plan |
| 500 | EXTPNO-UNKNOWN-001 | Request input validation failed |
| 500 | EXTPNO-OFFERS-CPOPOFFER-0002 | Downstream service error occurred while fetching product offerings |
| 500 | EXTPNO-OFFERS-CPOPOFFER-0004 | ATT Client not supported |
| 500 | EXTPNO-UNKNOWN-001 | Unknown Error |