How to Configure for Legal Entity VAT Tax residing country not equal to Operating Unit country

Hi EBTAX Gurus,

What is Best Practices solution for configuring ebtax where Legal Entities whose Tax Registration Country does not match the Operating Unit Country?
Scenario:
We have several Legal Entities (LE) who reside in and have tax registration in one country, but whose AP Operating Unit is another Country. This is due to the LE's FUNCTIONAL CURRENCY is different than it's residing country / tax registration country.

And the reasons for this are various, but the best example can be due to hyper inflationary economy and a more stable functional currency must be used for reporting purposes.

The best example is Argentina. Argentina has a hyper inflationary economy. Therefore the LE is configured under the USA USD Primary Ledger for reporting purposes. But for transactional indirect tax (AP tax) we want to configure Argentina specific tax rules.