Hi Alice,
What you could do is move the tapes to scratch media and then run a job on these tapes.
Do do that just right click on the tape and choose move to and then select here scratch media in the Media menu.
For more information refer to these documents:
1. http://support.veritas.com/docs/237374
2. http://support.veritas.com/docs/192265
==================
NOTE : If we do not receive your reply within two business days, this post would be marked assumed answered and would be moved to answered questions pool.