Form personalisation to warn supplier is registered on iSupplier portal in invoice workbench

Hello,

We went live with Oracle iSupplier portal.

Over 50% of our suppliers are on iSupplier portal now.

However, some suppliers are still sending paper invoices instead of using iSupplier portal.

We want to do a form personalisation on invoice workbench such that, if a payables clerk keys in an invoice in invoice bench, it pops up with a message saying , this supplier is registered on iSupplier portal.

Please let us know, how this can be achieved.

Further are there any exceptions reports on. how many suppliers who have signed up for iSupplier portal are using the iSupplier portal in reality.