Recognize date issues prior to accounting system sync

If the system can recognize when an issue date is after the payment due date and provide an error message, it will reduce the back and forth with the invoice approver. I found this error when I attempted to sync the invoice with Intacct. Now I have to abandon workflow, change the dates, initiate workflow, the approver has to re-approve, and then I can (hopefully) sync to Intacct.