I'm implementing auditing of inserts so I've implemented
IPreInsertEventListener and it's firing as I would expect however I'm
trying to create a new Audit record in the same database with details
of the record that was originally being created (via SaveAndFlush()).

An exception "Collection was modified; enumeration operation may not
execute." is being thrown and the transaction is rolled back.  I tried
creating a child session for the audit record but that didn't seem to
make any difference.  Does anyone have an example how to do this or
what I might be doing wrong?

        public bool OnPreInsert(PreInsertEvent e)
        {

            Audit audit = new Audit();
            audit.CreatedBy = "somename";
            audit.CreatedDateTime = DateTime.Now;
            <<others snipped>>

            audit.Save();

            return false;
        }

Many Thanks

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