A scan only gets the barcode from the tape, it does not tell BE what is actually on the tape henc eyou need to inventory them any time you change tapes. Inventory allows BE to know what is on the tapes, are they overwritable or appendable, etc.
I don't have a barcode reader so I cannot verify if it is currently working in 10.0. Perhaps someone else will chim in who has a barcode reader.