Service tax registration??

Dear Members,

Whether we require to amend service tax registration certificate on inclusion of one service, as we already have service tax registration under other service, As per negative list now the service tax is to be paid on one account, which is under all taxable services?? I think it is not required, due to amendment in Budget 2012, Becoz all services are taxable under one head except negative list.?

am i right?? if wrong please correct me?