Why is a IEFC166D message prompt presented when Detector MVS Modify commands are submitted from Batch JCL?

Document ID : KB000125390
Last Modified Date : 04/02/2019
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Introduction:
This document states why a IEFC166D message prompt may be presented when Detector MVS Modify commands are submitted from Batch JCL.
Question:
Why is a IEFC166D message prompt presented when Detector MVS Modify commands are submitted from Batch JCL? 
Environment:
z/OS 1.11 and above.
Answer:
The IEFC166D message prompt is presented when the COMMAND sub-parameter of the JES JOBCLASS command is set to VERIFY (eg. COMMAND=VERIFY). Examples of the JOBCLASS command can be found in dataset member SYS1.SHASSAMP(HASIPARM):

JOBCLASS(¢) ACCT=NO,
AUTH=ALL,
BLP=NO,
COMMAND=VERIFY,

The possible values are: COMMAND=DISPLAY|EXECUTE|IGNORE|VERIFY

This dataset is normally copied into a shop defined one. Your Systems Programmers should be able to tell you where these parameters are at your shop.