INH. UNIT PR. means "Inhibit unit price". It means there is no price preprogramed for that department or PLU. Each department can be left open-priced, or preset. Open price is how you usually think of using a cash register: you enter a price, then touch the button. Preset price requires programing a price for a department in advance, but saves time in operation. You touch the Coffee button, for instance, and it automatically rings up the price you've set for a cup of coffee.
If you touch a normal, non-preset department without entering the price first, the register will error with the INH. UNIT PR message.
Touch the
CLear key, enter the price, then touch the department.
Many of the Sharp registers, and I think the XE-A402 is one, allow a department to be both open and preset. It can also be programed to be inhibited completely.
The Owners Manual can be downloaded from Sharp
here.
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