Audit in OIE

Hi,

I have 2 questoins with respect to Audit in OIE

1) if i setup my Audit in OIE to say 50% how does the system do the audit for this? Is there some formula for the system to choose the expense reports for auditing?

2) In the Audit setup in OIE, there is a section called Confirmation Page IAudit ndicator. In this we can enter the Format for Auto Approved. Receipt Based -Audit and Paperless Audit. Can some one please tell me in which table this information is stored against a particular expense report

Thanks

Jay