Reg:pricing procedure issue

Hi all

I have a special scenario i have to create a pricing procedure where in i have the basic price cst 2% fright charge manual entry and service tax.ie 12.36 % on 25 % of FRT

Now we have FRE accounting key for the FRT account like wise for service in obyc can I use VST po input tax so that all these service charge would flow on the service account key (I would assign in pricing procedure this key VST)

Is this procedure correct?