Procedure to rectify outstanding tax demand

Hi,

I filed my E-return for AY 2012-13 and now following outstanding tax demand is displaying on the portal.

But I think, by mistake department did not consider my Self Assessment Tax of Rs. 1500 that I paid on 22-Aug-2012 and same is reflecting on 26AS at the site also.

Also I also mentioned the details (BSR Code,Tender Date, Challan no) of SAT in Row 25 (Details of Advance Tax and Self Assessment Tax Payments in TDS sheet) in ITR-1 excel sheet.

Please guide me in details how to proceed for the same.

Outstanding Tax Demand