| 1 | Transaction Set Not Supported |
| 2 | Transaction Set Trailer Missing |
| 3 | Transaction Set Control Number in Header and Trailer Do Not Match |
| 4 | Number of Included Segments Does Not Match Actual Count |
| 5 | One or More Segments in Error |
| 6 | Missing or Invalid Transaction Set Identifier |
| 7 | Missing or Invalid Transaction Set Control Number |
| 8 | Authentication Key Name Unknown |
| 9 | Encryption Key Name Unknown |
| 10 | Requested Service (Authentication or Encrypted) Not Available |
| 11 | Unknown Security Recipient |
| 12 | Incorrect Message Length (Encryption Only) |
| 13 | Message Authentication Code Failed |
| 15 | Unknown Security Originator |
| 16 | Syntax Error in Decrypted Text |
| 17 | Security Not Supported |
| 23 | Transaction Set Control Number Not Unique within the Functional Group |
| 24 | S3E Security End Segment Missing for S3S Security Start Segment |
| 25 | S3S Security Start Segment Missing for S3E Security End Segment |
| 26 | S4E Security End Segment Missing for S4S Security Start Segment |
| 27 | S4S Security Start Segment Missing for S4E Security End Segment |