Quarterly TDS Returns under Income Tax Act

I have to file Quarterly TDS Returns of A goverment Department. Department does not have PAN no. as it is a service department only getting funds from State Goverment and spent same for the welfare of general public but the Department has TAN no. While submitting Quarterly T.D.S. Returns, the software requires PAN No. to be filled and I am not able to prepare T.D.S. Returns. Is PAN no. a necessary requirment for T.D.S. Returns.