This is referred to as a No Sale.
If you have your cash drawer connected to your printer, there are two ways to open the till
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For this to work, you will need to follow the guide for Connecting a Cash Drawer to open automatically
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No sales can be found in the actions menu in the top right of POS

Then simply click No Sale

If you have a cash drawer plugged into your POS printer, and a printer connected to your POS, then click No Sale will now pop the drawer.
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If you need help connecting a printer, see Connecting printers to your POS
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