PO calculation for single vendor with multiple ST code

Dear all,

We have two different sales tax in our system namely AVRD for Local Tax & AVSC for Interstate sales tax.

There are incidence where both AVRD & AVSC is applicable to same vendor for same product.In such cases both AVRD & AVSC are displayed on the purchase order.Only one selected sales Tax should be displayed.

So please suggest me

Thank you all in advance.

With Regards,

Olet Malla