Hello,
In order to make a media appendable, you will need to configure the Append period as per your requirement. In order to do so, from the media tab, choose the media set in question, go to the properties tab and then set the append period. If you choose the 'infinite-allow append option', the media will be always appendable. You can then try the test run from job setup, test run under general tasks.
For more information on the append and overwrite options as well as media desciptions, refer to the following technotes:
Title:The basics of Advanced Device and Media Management for Backup Exec for Windows Servers
http://support.veritas.com/docs/192265
Title:An explanation of the "Overwrite Protection Period" and the "Append Period"
http://support.veritas.com/docs/237374
Hope this answers your question. In case you need more information on this, you can write to the forum with details.
Additional Information :
For information on the recent VERITAS Backup Exec security vulnerabilities, including links to the downloads for the necessary hotfixes, please refer to the following document:
Patch summary for Security Advisories VX05-001, VX05-002, VX05-003, VX05-005, VX05-006, VX05-007
http://seer.support.veritas.com/docs/277429.htm
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Regards.