recording ONCONFIG changes

Scanning the old messages I came across a "suspicion" from Neil Truby that IDS 9.2 was't recording all changes to ONCONFIG in the message log. I've recently spent many days trying to find why a problem had recurred and eventually I discovered that it was because a previous change to ONCONFIG had been undone. The problem I now have is to find out who undid the change, and why? I thought I would find out when the change occurred but it doesn't appear in the message log, which fortunately hasn't been cleared down for a long time. Does anybody know why all ONCONFIG changes are not recorded to the log? And what mechanisms can I use to track all the changes. regards Malcolm