Hi,
I suppose it is because parameter XMILOGLEVEL=1 is not set in table TSPOPTIONS.
Please note that you need to restart system after change.
Adjusting the AUDITLEVEL has no effect to XOM event-messages.
See also blogs:
http://scn.sap.com/docs/DOC-10306
http://scn.sap.com/docs/DOC-14113
Regards
Martin