We have something like this at the supermarket I work at. Only supervisors can do quantity. It's a really annoying system designed to prevent different items being scanned as the same (e.g. a Diet Coke and a regular Coke have to be scanned as that - not two Diet Cokes), but people just end up picking up the one item and scanning it twice. It also used to appear the number of times it was scanned on the receipt as well (e.g. 20 lines if there were 20 Cokes), but now (fortunately) it says Coca-Cola xx @ $x.xx, no matter which way they are scanned on.Although there's reasons for it, it's incredibly annoying.