This document states why a IEFC166D message prompt may be presented when Detector MVS Modify commands are submitted from Batch JCL.
Why is a IEFC166D message prompt presented when Detector MVS Modify commands are submitted from Batch JCL?
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):
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.