Hi Bruce and Ilona
When the mis-dated invoices are in the past, it's an annoyance but not a crisis. But if "someone" had used a date in the future, say 3/1/2018 instead of 3/1/2017, that's a crisis.
This is where GridView Read/Write and some database knowledge becomes very valuable. I know because I solved this exact problem for a client yesterday; not only was it future-dated, but it was worse because 1) they use Invoices to bill, and 2) some of the invoices were paid.
Steve