Service Tax Returns

I applied for service tax registration on jan-2011 and received ST-2 by Jan-2011 end. Turnover for the FY 2010-11 is Rs. 6,00,000/-. While filing service tax return (ST-3) for the half yearly (i.e Oct-10 to March-11) I want to claim exemption under notification 6/2005-Dated 01/03/2005; for SSI; because turnover is not crossed 10 lakhs. My doubt about ST-3 is whether i should update the sales\turnover for the period in the respective coloumns or just write zero (i.e. Nil Return)  in the turnover figures.