The <file-definition-name> tab is displayed.
The inner Redundancy Set option indicates if the item is already a member of an item set.
and select
<New> to create a new item set, or select an existing item set.
The data item is added to the item set.
The Redundancy Set option indicates the item set with which the item is already a member.
and select
<None>.
The data item is removed from the item set.