QUESTION ABOUT CAY6037I ON DFSORT

Customer asked about CAY6037I on DFSORT which was not issued on 11.0.

//ST040   EXEC  PGM=SORT,REGION=2000K,PARM='DYNAUTO=IGNWKDD'

//ST040   EXEC  PGM=SORT,REGION=2000K,PARM="DYNAUTO=IGNWKDD"

CAY6037I UNKNOWN KEYWORD "DYNAUTO" SPECIFIED IN OPERAND OF "PARM"

An actual run by DFSORT issues ICE067I 0 INVALID PARAMETER IN JCL EXEC PARM OR INVOKED PARM LIST message.
JCLCheck 12.0 is able to detect this invalid parameter. It works as it is expected.