I have provided services of value, say, of Rs 30.00 lakhs in April/May 2013 and raised invoice also. But I have not received any payments against the invoices. I opted for Sl.No.B1.3 in ST-3 form i.e. service tax will be paid when payment received. When I completed the ST-3 form it gave error saying ST payable but not paid. Also when xml file generated it also gave error. Kindly comment and advise whether I have opted for correct option instead of paying ST when I received nothing.