IDR Invoice Number Creation

We have an issue with some of our utility suppliers, we receive the invoice with our account number assigned, but no invoice number. We currently manually enter the invoices and use the account number plus the date to create a unique invoice number

Content (required): As mentioned above, with some of our utility vendors the invoice number on the invoice is our account number. It is the same "invoice number" every month. Is there someway we could leverage IDR to use the account number and add the date or some other convention to make the invoice number unique. Using the account number would only work for one period. Then the invoices will fail due to duplicate invoice numbers. We receive about 600 utility invoices each month so there are going to be a lot of failures.