Service tax return??

Dear Members,

As per new Rule Service Tax is payable at the time of billing of or at the time of service provided, whichevere is earlier.

I have not received any amount against the service provided in FY 2011-12. But i have to pay service tax on the amount charged from my clients.

Now the question is that when i fiilling ST-3, If i m not filling the colom of (I)(a)(i) of sheet payable Service, then sheet is not validate ans shows that Taxable Value should be equal to service tax rate wise break up of Taxable Value. However actually i have not received any amount against service provided so it is not correct in my view?

Please let me know that is the ST-3 form is correct as per new point of Taxation Rules?? If Yes the how i fill the form when i have not recived any amount agaist service Provided??

Please Reply soon??