Hello Manjit,
It seems you are using the Append to media overwrite if no appendable media is available. However in this case, you will need to provide a new media for the job to continue. Backup exec will not overwrite the same media that is in the drive. This is by design.
Revert if you still have any other questions on this case.
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.
Regards.