Identify proxy user on workflow approvation action

Hi,

I've a question:

when a user acts as a proxy user (R12.1.3), he can approve Requisition using the proxy user functionality. User that autorize the delegate using the Proxy Report can't view the approval action done by the delegate but he can only view the Notification page visited by the delegate.

Does somebody know if there is a standard functionality that can trak the approval action done by the delegate?

Thank you,

Alessandro