I'm guessing this is a Casio register in which case you have programmed a condiment to a PLU (item). You need to check your manual in PLU programming and find the codes to set condiment PLU to no or set a zero in that part of programming. if you don't have a programming manual, you could try checkout tech.
https://the-checkout-tech.com/manuals/cashregisters/Casio1.php
They give free help if you get the manual through them so they can point you to the right codes and links in the manual to clear it. hope this helps
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