WebI Issue in report

Hi,

I have a report in that display dats is Jan2008,feb2008,Mar2008....Jan2009,feb2009...

lov also I get in the same manner.the sort which I am getting is not proper currently. I want a sort oredr like Jan2008,Feb2008..DEC2008,JAN2009,Feb2009 like wise.

I applied custom sort but we can do it if we have fewer values but here I have so many months where custom sort cant be possible.Could somebody suggest how can do it.

I am using WebIntelligence,BOXIR3.1 Thanks In advance.