After a synchronous request, or a CHECK or ENDREQ macro, the return code in register 15 indicates if the request completed successfully. Table 1 describes each return code returned in register 15.
| Return Code (RPLRTNCD) | Meaning |
|---|---|
| 0(X'0') | Request completed successfully. |
| 4(X'4') | Request was not accepted because the request parameter list indicated by the request (RPL=address) was active for another request. |
| 8(X'8') | Logical error; specific error is indicated in the RPL feedback area. |
| 12(X'C') | Physical error; specific error is indicated in the RPL feedback area. |