Wrong assesement year

Hi Experts,

For the financial Year 2010-11, i have e-filed my returns and  paid an self assessment tax online using net banking.  While filling up chalan online i have mistakely selected Assesment Year as 2010-11 instead 20111-12 and paid the amount..

I came to know about this mistake when i saw my 26AS  for FY2010-11 in nsdl.

Please let me know how to correct this ?

Any help is very ,much appreciated

Regards,

Kiran