px12-400r LenovoEMC & BACKUP EXEC

Hello 
I have a px12-400r LenovoEMC with firmware version 4.0.2.9960. 
I use Backup Exec 2012 and when I enable a shared resource in the "Allow users to change the file-level security" Backup Exec can not access resources to capture the backup. 
Is there any posibildad to solve this problem? 
A greeting and thank you very much