Hi Vivek ,
It works in that way only .
Schedule to their inbox and Enterprise , In Launchpad ->New ->Hyperlink write opendoc syntax to read the latest instance of the report.
http://server:port/BOE/OpenDocument/opendoc/openDocument.jsp?sDocName=Name&sInstance=User
So the workaround is to used sInstance=Last###and schedule the
instance to default enterprise also