I have note this strange behavior when I export, delete and reimport a policy.

In the "Global Settings"-"Storage Device Control" I have enabled and configured some preferred device. When I export and reimport the policy disappear all entry in the "Comment" column of the "Preferred Devices" table and the "Enable Preferred Device List in the Policy" chek box are not checked while before export was checked

I note this behavior in ZESM 3.5 ir8 and ZESM 4.1

Is there a workaround to avoid this issue?