When you take money out of the till you need to deduct them from your numbers in order for your EOD process to match. You need to use the return button and cash out the payment on the right tender type which is linked to your accounting integrations too!

This is how your staff needs to operate:

This how you setup your return reason codes and tender types in your
​POS backoffice:

This is how you setup your tender types in your POS backoffice:
A suggestion here is to either make one tender type called 'Staff expenses' and group all expenses under that account or make the same matching in a granular form e..g Waste as reason code and 'Waste' as tender type.
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