I have Odoo V8 implemented with POS.
My employees are extremely untrustworthy and I found several occasions in which they avoided finalizing a sale by pressing F5 to refresh the POS page, having already received the payment from the customer who did not ask for a receipt. That way there is no record of the sale and the employee simply pockets the cash.
How can I:
1) Block the user from refreshing the page using F5?
or
2) Keep items after refreshing the page and requiring a supervisor password to remove items from a sale?
or
3) Kep a log of all user input in a POS session which can be checked later for items that were scanned, but not paid for.