Is it possible to create a tax rule to override the application tax options?

Hi,

Our application tax options for Payables are currently setup as below:

1) Supplier Site

2) Reference Document

3) Oracle Payables Financial Options

We cannot change these defaults as it will impact on our BAU activities, however it is causing a problem for intercompany invoices. When the intercompany invoice is created, it inherits the tax line from AR (as expected) but it also picks up the tax classification code from the Oracle Payables Financial Option as per the Payables Application Tax Options. I have tried to setup a tax rule on the offending Tax Regime to make it non applicable for intercompany transactions, but unfortunately this has not worked.