U0147 abends in HP Pointer Checker due to DFSORT

The DFSORT Messages and Codes manual describes the problem:
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

ICE147A OPTION STATEMENT OPERAND SORTIN OR SORTOUT NOT ALLOWED Explanation: Critical.
The OPTION statement operand SORTOUT was specified for a "Conventional" merge, or the operand SORTIN or SORTOUT, was specified for a tape work data set sort, or ICETOOL was used for a tape work data set sort.
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

The SORTOUT DD, in the HP Pointer Checker MERGE process, is the CHECKREC data set. The CHECKREC file usually resides on DASD. DFSORT is invoked twice during HP Pointer Checker processing - once in a SORT step and once in a Merge step. The U0147 abend happens when a "Conventional" MERGE occurs in the HPPC MERGE step. To resolve this issue, run the HPPC job again with the "SORTDIAG DD" statement added to your JCL. Review the SORTDIAG DD output and remove the reason why Blockset cannot be used. When BLOCKSET can be used, the problem will disappear.