That I don't know off the top of my head, sorry. I do know when I've set stuff like that up, I was following steps on the SuiteAnswers articles that talk about RC. It's something with associating RC codes with the standard code, but I don't recall how to tell it to use one or the other. Something to do with the Billing or Shipping Address country I think. You'd probably have to dig through SA if no one else knows.