Reason codes in the range 8000–8999 signal error conditions detected by the exit program. Within this range:
If the user exit program completes with RC=8 with one of these reason codes, the CICS Configuration Manager ISPF dialog interface will automatically display a user error message reflecting the error condition. This eliminates the need for the user exit program to prepare reason text for many common errors. Unallocated reason codes in the 8000 to 8299 are reserved for future use.
For details of the predefined reason codes, see the CICS Configuration Manager ISPF dialog interface: