​If you enter an invoice that has the same Invoice Number as one you have previously entered, Payment Services will display a Possible Duplicate Invoice message. It is not an error. It simply means that you may have inadvertently entered a duplicate invoice number. You can use the same invoice number if needed.

Figure 1 - Message for a Possible Duplicate Invoice

1. Click the Possible Duplicate Invoice message to display a display of the duplicate invoice information.

Figure 2 - Duplicate Invoice

2. Once you have verified that you are not adding an invoice you have already entered, click New Invoice at the bottom of the web page, re-enter the invoice number, and then click Save & Continue.