Backup tapes not appending on backup exec 2014

[alisaf]

I have the tapes in a media set that has overwrite protection period of 3 week and the append period set to none with infinite allow append.  I remove the used tapes once a week.   The tapes are not appending first.   It seems like it uses the scratch media first before appending the tapes.   I have an lto6 tapes and only using 10% or so at the time of week when I take out the tapes for the week.  I have backup exec 2012 with the same set up and it works there.   The only difference is that I back up to disk then immediately to tape on the 2014.

[lmosla]

In Backup Exec go to Settings and choose Overwrite Recyclable media contained in the targeted Media Set before Overwriting Scratch

[pkh]

There are a lot of reasons.  See my article below, particularly the part about overlapping jobs.

https://www-secure.symantec.com/connect/articles/why-my-job-not-appending-data-my-tapes