demand u/s 143(1) :- mistake in return

One of relative has received an intimtaion U/S 143 (1) , which is Deemed notice U/S 156 .

for Assessment year 2008-09 i.e Finacial Year 2007-08.

However, now we have observed, that there was a mistake in the return of income.

my question is now what do do ????  because the time limit has U/S 139(5) for revised return has

also been over,

what are the measure available  ???
 

can we file the, the rectification Applicaltion U/S 154, But we cannot apply for rectifictaion also ,

as mistake is not the order , but the mistake was in the return of income only.

Reagrds

Amit Ingale.