Privilege for isi_changelist_mod

Hi,

OneFS 8.2.2

I created a local user who shall evaluate the changelists of two snapshots for backup purposes. The user is member of a role with the privileges ISI_PRIV_JOB_ENGINE and ISI_PRIV_SNAPSHOT. He can create snapshots and run the ChangelistCreate job. But when he enters the command "isi_changelist_mod", he always gets the error: "Error opening btree root: Operation not permitted". I tried several privileges, like Namespace traverse or Platform API, but nothing works. 
What privilege do you need to use the isi_changelist_mod command?

Thanks,

Dirk