AP Module AME - report or workaround for finding stuck invoice with invalid approver?

We're using Oracle EBS R12 and implemented the AP AME workflow approval last summer.

We pull the data entry personnel's HR record supervisor to route worklist notifications. We recently had invoices that were stuck in initiated status because the HR record did not get updated before the supervisor's record was termed.

Does anyone have a report or another workaround to identify these invoices? I received the below error message when looking at Reports>Review Invoice Approval History, but with it noting "runtime error", I'm not sure whether we could create a custom report based on the error message number?

As a follow-up to that question, is it recorded in the database when the invoice goes out for approval and has nowhere to go?