Hi Alan,
If the tape is scratch, it's going to get used.
1 way around this is to partition your autoloader (if you haven't already).
Simply right-click your device, and choose the option to partition it.
Create the necessary partitions, and then go into your jobs and point them to these slots.
This will prevent BEWS from moving onto a tape that should not be used. Just remember to load the correct tapes in the correct slots.
Laters!