Intelligent Exception reporting in Oracle Payables ?

Hello,

We use Oracle iSupplier portal.

We noticed some suppliers are using different tax codes to charge more money than they should.

This is a compliance issue from regulatory point of view as well.

Is it possible to create an intelligent alert, such that, the SQL will scan the database for previous invoice tax codes for each supplier and alert whenever there is a deviation from the norm.

Say the supplier historically always charged 10% and 15% VAT. So 10% and 15% are accepted norm.

Now if the supplier charged 20% out of the blue, an alert should be generated to the payables team, so that they can investigate.