When does Appendable not mean Appendable?

When you use Append Infinite in Backup Exec 2014...

When a media set is set to Append Infinite the media automatically becomes un-appendable. The work around is to apply a limited append period to the media set and your media becomes writeable for append jobs once more.

Remember also: Only the first tape in a media set can be appendable. If the job runs over to a second tape it will only try to overwrite it, not append to it.