This suggestion is over a year old now and I don't see that the option to have PO numbers has been added. Can you confirm we are still waiting for that fix? It is the way our clients track their payments, not with our invoice numbers, but with their PO's. The extra work to document multiple PO's on a past due statement is not easy and the fact that the PO is on the invoice should make it infinitely easy to add as a print option on the past due statement. Please advise if this is being worked on. Thanks!