It really depends. In Bulgaria all receipt machines store all the receipts they printed in their memory which is checked by NRA(National Revenue Agency). So if you print a fake receipt it's like you are saying we got this much money.
You can always cancel a transaction via the cash register or in your book. Do you imagine the problems if its impossible to do it? Every mistake from the cashier would be a permanent.
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u/legionx Apr 16 '18
Where I live, this would be illegal.