I'm in the store. I buy 5 different flavors of fruit leather. They are different colors in different packages. Different SKUs with different GTINs, hence each has a different UPC barcode.
So what does the cashier do? Scan one and hit the 'repeat X5' key. I realize all she's doing is harvesting the price. To hell with real time inventory tracking.
When I mention it she mumbles something to the effect of "well, if that's the way you want me to do it sir."
Her MIS dept. must love her.