Recoverable Tax is not calculating Properly when Invoice is matched

Hi,

We have two Operating Units.

Operating Unit A has already setup for Recoverable tax calculation for Manual Invoices as well as PO-matched Invoices.

Now we are introducing Recoverable tax Calculation for Operating Unit B - its working fine for manually created non-PO matched Invoices but as soon as we try to calculate Recoverable Tax on PO-matched invoice its not working properly:

   1. Not Calculating Recoverable Tax

   2. Non-Recoverable tax is hitting incorrect Code Combination.

It seems that PO-matched Invoices are not all looking at the Tax Rules.

I am sure I am missing a setup but not sure where to start looking.