Wrong pan no written in tds return filled

1.you can revised return FY 2010-11 and 2011-12, yes it necessary...... otherwise you are liable to pay penalty for given wrong pan no.

2. check your tan registration letter and if wrong data display, you will apply to rectification for tan

Even if letter containing TAN no is misplaced you can still revise your TDS return as you have your tan number with you...

But, You will require the acknowledgemnt number for revising return...