pre-packed audit reports don't work on oracle.
What I did is to use the same objects that were used in those reports, and try to create a report with webi using audit universe.
I do see some results. But it only shows the reports/events that were successful. There are no records that show the event_status: failed. I even tried having filter: event_status=failed -- no data.
Secondly, it only works when you have 'this month' as a filter only. If you try to see reports that ran today or yesterday, it gives 'no data to retrieve'.
But this does help though to some extent.
thanks.