Why don't you just turn the key to void mode and enter the item you want to void, then the payment type?
It's easier than trying to make negative departments.
Make sure you remember to turn the key back to reg afterwards.
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If anyone needs a Sharp XE-A106 manual, C-tech collective have it here:
http://the-checkout-tech.com/manuals/cashregisters/Sharp_XE-A106_operation_manual.html
Registerman
March 2011