You have turned the key before finishing a task. Turn the key back to the last position and the error should go away. Now finish what you started in that mode before turning the key.
When programming tax, you need to set the rate, whether it is add in or add on tax, and link the tax to the products on your keyboard. See how you get on. Let me know if you get stuck.
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http://the-checkout-tech.com/manuals/cashregisters/Casio_PCR-450_operators_and_programming_manual.html
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