The Sales button is right next to the Camera button on the App. So it is very easy to accidentally tap that button instead of the Camera button, which then sends all subsequent scans to the Sales Inbox when they were intended for the Costs Inbox. While there is a way to move the items to the correct Inbox, there seems to be no way to trigger Dext to re-extract the fields using the Supplier rules.

How about asking for confirmation when switching Inboxes?