Derive the tax code from the 'delivery address' tab in the purchase order?

Hi,

We want to derive the tax code automation in the PO by using the country and region fields from the 'delivery address' tab in the purchase order. We have tested with the extended fields catalog for condition tables (KPMG / KOMK / KOMP) with no success.

Has anyone faced this requirement before and found a solution?

Thanks,

Jesus Flores