IRLM return and reason codes

The IRLM return and reason codes are listed below. The database management system (DBMS) referred to throughout the return and reason codes is either DB2® or IMS™. Some return and reason codes do not apply to DB2 operation.

The values in the 'return code' column show the request completion status:
00
The request completed successfully.
04
The request completed successfully, but the state of lock remained unchanged.
08
The request completed unsuccessfully because of a system error or condition, not a problem in the request.
12
The request completed unsuccessfully because of a logic error in the request.
16
The request completed unsuccessfully because of an invalid request specification.
20
The request completed unsuccessfully because IRLM resources are not available.