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Items that have a zero price recorded cause a Price Entry dialog to be displayed, when sold. This does not change the price of the product permanently; just for this sale. Such items can be used for goods which are counted for stock control, but which do not have a fixed price. Loose cut cheese would be an example. Price encoded bar codes are a better solution, where this is possible. Another example would be live (aquarium) fish which are charged for depending on their size. Bar codes are not practical, here.
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