In the case that you accidentally scanned a ticket you can reset that ticket to be scanned again. Here are the steps to do this.

• Goto orders
• Find orders
• Locate order by filter or search
• Click actions > View edit
• Click on the ticket in the order menu
• In the status box change to purchased
• Click Save

This will set this one ticket back to purchased and be ready to be scanned again. You must do this for each ticket if there's multiple tickets in the order.