2 Approvers for one user based on Operating Unit in AP Invoice Approval

Hi,

We are in R12.1 . I have a scenario where we need to set up 2 approvers for a particular users based in AP invoice approval. We are using AME too. For example if this user creates an invoice in operating unit A,it should go to person X. If this user creates an invoice in operating unit B,then it should go to person Y. How can we set up this using AME?

Thanks,

Dimansu