How can I see sort messages when I get IXX0439 or IXX0855 errors?

Document ID : KB000028798
Last Modified Date : 14/02/2018
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VISION:Inquiry issues IXX0439 or IXX0855 message when an error occurs
n the sort program during sort processing.

These are documented in the Messages Manual:

IXX0855 FORMAT SORT HAS TERMINATED WITH AN ERROR
       When this message appears, you should get an error message from
       SORT on SYSOUT or on the JES log that will help you resolve the
       problem. If no SYSOUT or JES log message appears, contact
       Computer Associates Technical Support for a patch. 
IXX0439 UNEXPECTED RETURN CODE FROM SORT
       When this message appears, you should get an error message from
       SORT on SYSOUT or on the JES log that will help you resolve the
       problem. If no SYSOUT or JES log message appears, contact
       Computer Associates Technical Support for a patch.    

The patch referenced in the description is IQ00057 which is now obsolete.
Instead, add the following to the JCL depending upon your sort product:  

For DFSORT:
  //DFSPARM  DD   *
MSGPRT=ALL,LIST
/*  

For Synsort:
  //$ORTPARM DD   *
MSG=AP,BMSG,LIST
/*                                                                        

Then rerun and resolve the error indicated by the sort messages.