Invoices from iSupplier Portal

Since we upgraded to R12 the iSupplier Portal invoices no longer stop in the AP Interface. I'm trying to determine if anyone knows of a way to make them stop in the interface so we can make corrections before they come in to the Payables module. We can no longer make corrections in the Payables module for these same invoices and there are many times when our AP processors have no available actions they can do. This is causing us a great deal of time trying to zero out the distribution lines and they have to manually enter them back