You can define a set of conditions and comparison logic to be evaluated to grant access to an object.
Note: To enforce the access control policy for All of and One of, ensure that the properties that are referenced in the Column source fields are optimized and included in returnable form in the custom search properties that are stored in the search index.
If you select Is null or Is not null in the Relationship field, the Treat Empty As Null check box is automatically selected. When Treat Empty as Null is checked, even empty values are considered null.
If you select Is null or Is not null in the Relationship field, the Value field is not active.