It won't hurt if you treated those with less experience in an uncondescending manner.
I posted here because I can't find what I'm looking for on Google, and on the Google group - ibm-main.
If there were people who knew about this, I wouldn't be posting here. It takes less time to ask them, than to get a solution here.
Jobs that are a part of newday processing (through Control-M) show the message. And I went through the syslog of about a month, and found that few jobs do produce IEF403I. I managed to find one such job and used the same jobcard (test environment). No change. I'm sure its probably not relevant, but I gave it a shot.