| Reason Code | Description |
|---|---|
| 04 (X'0004') | Mismatch between format-1 DSCB and VVR/NVR. |
| 05 (X'0005') | FREEMAIN error (SVC 5). |
| 08 (X'0008') | Error accessing the VTOC (CVAFFILT READ). |
| 12 (X'000C') | Error accessing the VVDS (VVDS Manager). |
| 32 (X'0020') | Parameter list error (eye-catcher, length, UCB address, or function requested). |
| 64 (X'0040') | Major error (ABEND). |
| 120 (X'0078') | GETMAIN error (SVC 120). |
| 139 (X'008B') | CVAF error (SVC 139). |