Prevent Backup Exec 2010 R3 from "owning"/"locking" tape device

Dear all,

I do have the following situation:

I'm backing up Enterprise Vault with the BUE 2010 R3 latest SP and updates agent to a disc device.
On the same server running BUE, has another backup software, which should now be used for the tape backup. (No, i don't want to use BUE for it. Fact.)

The problem is: BUE does kind of "lock" the tape device.
If all services are running, i can not use the drive with the other program.
If i stop the device service, it is usable with the other program.

Does anybody have a solution, to prevent BUE from "locking" the drive / making it it's own, and still work with the disk devices?

kind regards from Austria,

Rafael