02B

Explanation
The JES2 user exit effector routine for the user
environment diagnosed an error in the processing of the exit routine.
The hexadecimal reason code in register 3 indicates the cause of the
abend:Code
Explanation
00000000
A user exit routine issued a return code that is higher than the
maximum return code value specified in the MAXRC parameter of the
$EXITnnn macro instruction.
00000004
The JES2 exit effector determined that the save area has improper
format after calling the user exit routine.

System action
The system abnormally ends the user task and issues
a dump.

Operator response
Use the $TEXIT command to disable EXITnnn.

System programmer response
Collect all printed output and output
data sets related to the problem.
For reason code X'00000000',
if the exit routine is issuing an incorrect return code, correct the
routine. If the routine is issuing the correct return code, change
the maximum return code value specified on the $EXITnnn macro instruction.
Then rerun the job.
For reason code X'00000004', determine
if the user exit routine overlaid the save area. If not, determine
if the user exit routine destroyed register 13, which addresses the
save area.

Source
JES2