When one ISMF function calls another, the return code from the called function is placed in register 15. Table 1 lists the standard return codes that are used by ISMF. Some of the individual interfaces may define return codes differently.
| Return Code | Description |
|---|---|
| 0 (X'00') | Successful. |
| 4 (X'04') | Function performed with minor error. |
| 8 (X'08') | Function not performed; no termination. |
| 12 (X'0C') | Function not performed; terminating error. |
| 16 (X'10') | Function not performed; terminating error. |
| 20 (X'14') | Function not performed; terminating error. |