Duplicate invoice numbers issued by Supplier

Is anyone aware of any profile option or feature in payable that allows for duplicate invoices number to be recorded for certain suppliers. We have a certain supplier that issues us duplicate invoice numbers in a given period. Since there is no way for us to control thier internal number generation I would like to know if there is some unknown feature out there that Oracle has for this convoluted pratice. The only option i can think of is creating a custom program to append a unique identifier to the invoice number.