ICE172A

Explanation
Critical. XSUM was specified on the SUM statement.
DFSORT does not support the XSUM parameter provided by a competitive
sort product to write records deleted by SUM processing to a SORTXSUM
DD data set.

System action
The program terminates.

Programmer response
If you are using SUM FIELDS=NONE with
XSUM, you can perform the same function with ICETOOL's SELECT operator.
For example, if you are using XSUM as follows://S1 EXEC PGM= ICEMAN
//SYSOUT DD SYSOUT=*
//SORTIN DD DSN=...
//SORTOUT DD DSN=...
//SORTXSUM DD DSN=...
//SYSIN DD *
  SORT FIELDS=(5,4,CH,A)
  SUM FIELDS=NONE,XSUM
/*

You can use this ICETOOL job instead://S1 EXEC PGM=ICETOOL
//TOOLMSG DD SYSOUT=*
//DFSMSG DD SYSOUT=*
//SORTIN DD DSN=...
//SORTOUT DD DSN=...
//SORTXSUM DD DSN=...
//TOOLIN DD *
SELECT FROM(SORTIN) TO(SORTOUT)-
  ON(5,4,CH) FIRST DISCARD(SORTXSUM)
/*

Related reading: You can also perform additional
functions with ICETOOL's SELECT operator that are not available with
XSUM. See z/OS DFSORT Application Programming Guide for
complete details of ICETOOL's SELECT operator.