The roles required for some of the features are at a cluster level. Thus, you will need to define a ONTAP user that will be a Cluster scoped User. In your example, it appears that the user is for the specific vserver, itxone_sas
I will validate one more thing; yet see if a cluster scoped user with the appropriate privileges accomplish objective of being able to use the Extra Specs for Disk Type for you.
On 9/5/14, 5:51 PM, "OLIVER.LIENHARD" <firstname.lastname@example.org<mailto:email@example.com>> scribbled in chalk: