What edge cases trip up point-of-sale systems in grocery and supermarkets, including barcode printed on two products?

In grocery and supermarkets watch for: barcode printed on two products; scale and barcode both carrying weight; item sold below cost; expired item scanned; price changed while basket is open; power cut in the middle of a sale. A system that cannot handle these will frustrate the business; the catalog's failsafe items address some generic cases.

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