Revised Return

Hello Everybody,

My doubt is -

A company filed its return with a loss of 50 lacs for the A.Y.2008-09 within due date. The Assessing officer assessed the return and added back Rs.5 lacs as per 43B disallowance which is allowable as deduction in A.Y.2009-10 and reassessed the loss as 45 lacs.

So the company need to revise the return for the A.Y.2009-10 & 2010-11.

Can i revise the return of A.Y.2009-10 as the time limit expires on 31.03.2011....?

If not, Is there any remedy for the same....?