If you have Auditing enabled in your BO environment, then you can find this WebI report. For detailed information about auditing please check the links and documents below.
http://www.sdn.sap.com/irj/scn/index?rid=/library/uuid/40711187-04e8-2d10-d190-851e20c7665a
Have a nice day.
Message was edited by: David Metser