A06

Explanation
The error was detected during processing of either
a LINK(X), LOAD, XCTL(X) or ATTACH(X) macro instruction. Code
Explanation
04
A request block (RB) is requesting a serially reusable program.
Another RB associated with the task requested the same program, and
that request has not yet been satisfied.

System action
The task ends unless ERRET is specified on the
macro. The system issues message CSV000I. The system issues an ABEND
dump.

System programmer response
If the error recurs and the program
is not in error, see the system programmer for the messages in the
job log.
If the problem persists, search problem reporting data
bases for a fix for the problem. If no fix exists, contact the IBM® Support Center. Provide the
ABEND dump and the source program listing for the job.

Programmer response
Change the program to wait until the serially
reusable load module is run before issuing the LINK(X), LOAD, XCTL(X)
or ATTACH(X) macro for the load module.  After making corrections,
recompile and run the job step again.

Source
Contents supervision (CSV)