Vendor has started to recycle / reuse old AP Invoice Numbers... how to accommodate?

Hi; One of our vendors has started to repeat, or re-issue, Invoice Numbers they previously used about 4 years ago.  (These are appearing on new AP invoices they issue to us, which are completely unrelated to the ones they issued 3-4 years back -- it appears their internal invoicing system has simply run out of numbers in their own sequencing, and is now "starting over"...)

We're not ready to purge old AP data from our system -- is there another option to consider, that would allow us to accept their (new) invoices (matched to new PO's, not related to the old invoices/old PO's from years ago) when the AP invoice number might already be in our system from years earlier?  (We process 99% of our AP Invoices via automated inbound EDI transmissions, rather than manual entry.)