Service tax - premises code query

Hi Experts,

Please help me out.

We are revising the service tax return for the period from April 2012 to June 2012.Whereas, subsequently we have amended our registration to centralised return filing hence there is change in the premises code.

Now wen we are filing the revise return shall i use the old premises code (single registration ) or new premises code (centralised registration) ???

Thanks in advance.