Role Level Security doesn't work in SharePoint 2013....?

Hi,

   I implemented the Role Level security in Tabular Model using USERNAME() function. When i export the data view in Excel for the User it works fine by showing his own data. 

I created the same model connection in SharePoint 2013 and tried to access the data through Power View report it fails.

For the user restricted in Excel,it show entire data here.

Please let me know if need to do any changes in SharePoint.

Both SharePoint and SSAS instance are in same server.

Regards,

Avula.Gk

Thanks, Avula.GK www.solverminds.com