This is why I made a mini-inventory for my team to complete before ordering. It lets them see the actual on-hands, whats on sale and since they (are supposed to) check the quality of full cases they know what might get QMOSed. Only helpful if your store isn't anal about guardrails though, as we are constantly against them even when on hands are accurate.
The salesfloor/backroom QMOS thing I've argued more than once, and
@OtherGuy has said it should work properly no matter where it came from. Although I know it doesn't. It still replenishes if the salesfloor is full, you pull a rotten case off the shelf while backstocking the order, then QMOS it. Instead of knowing the salesfloor is full already.
There was something else today I wanted, but now I can't remember what it was....