Contract billing Tax account defaults to RT instead of RTXXXX account.

We use vertex Q series for tax calculation. I created a contract master and detail records with a ship-to address in California. Subsequent ran the invoice generation service R52121 which calls the respective program to generate AR entries and print the journal register. Tax accounts always default to RT and my question is where should the GL Offset be entered so that the system is able to use the desired RT**** AAI? Can you please shed some light on the above issue?

Thanks

Sunil