Can one add an operating unit to multiple tax regimes in different countries?

Hi;

We are setting up a branch office for manufacturing in Spain that belongs to a US Legal Entity and Operating Unit.

At the suggestion of Tax advisor, we would like to setup the Spain office as an inventory org of the  US LE and OU instead of its own Spain LE and OU.

But I have concerns with the filing of VAT and how it works in Oracle.

Will eBTax allows a US LE and OU assign to 2 tax Regimea; i.e. we have already assigned the US LE to US Sales and Use Tax regime, can we add the  same US LE to Spain Tax Regime?