56F

Explanation
The error occurred during end-of-job processing
for a JES2 job that was being processed by an execution batch monitor.
 The execution batch monitor pseudo job select procedure found that
another task was holding or waiting for a lock on the SJB (subsystem
job block).

System action
The job terminates.

System programmer response
Make sure the failing job step includes
a SYSABEND DD statement.
If the problem recurs and if the program
is not in error, search problem reporting databases for a fix for
the problem. If no fix exists, contact the IBM® Support Center.

Programmer response
Notify the system programmer or installation
manager of the problem.

Source
JES2