Service Tax on Flat purchased in 2003 but Conveyance Deed registered now.

Dear Sir,

I had purchased a Flat from a Developer (Builder) in Jan 2003 by Agreement of sale for Rs. 20 Lakhs. The possesion of the Flat was given in July 2003. But the Conveyance Deed could not be completed as the original land owner died without a will. All the legal heirs have agreed to complete the Conveyance now. 

Please advice is Service Tax applicable even though all payments were completed before July 2003.

Regards

Arun Tainwala