When selecting "Purchase Order" from the payment methods in the cart payment section, the screen still shows "Credit Card Number".
While this is just a nomenclature issue, it certainly explains why an order came through today with a credit card number in the Purchase Order field.
In version 3.89 all the labels on the pages are in resx files now so we have to make a small change to change the po number on step 2. Thanks for reporting it!
Greg,
Just emails you the hotfix for this.
Dave