Dynamic File name in SAP WEBi

Hi Experts,

We have scheduled one report in SAP Webi. But we want the filename of the webi reports to be dynamic.

Example - if i run the file on 25/07/2014 then the file name would be - 100101 _ R0112_20140725.

100101 - Vendor code

R0112- Report no.

20140725 - run date.

How can we achieve this in WEBi.

Thanks,

Abhi.