R12.1.1: Payment Workbench issue due to invoice volume

File this under thinking about going to R12.1.3 if you are upgrading, needing to apply this patch if you are on R12.1.1 or even a new entry that should be in your testing suite.  On R12.1.1 it is possible to have the Payment Workbench not allow new payments to be entered if there is a "high number of invoices" per My Oracle Support document "Payment Workbench Does not Work with Payment Patches That has High Number of Invoices" note ID 1467259.1 which seems to be an odd situation to be in for a form to stop a function due to data volume issues.