Setting a data model in the Arbitration campaign
Data models decide the structure of the data to be managed. They are used for the syntactic and semantic validation of data.
You can define the read/write access permission per role to each of the attributes listed in a data model.
Procedure
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Select the buttons next to each of the attributes in the data structure to set
permission per attribute and per data steward and define who can view which
attributes.
Option Description 
Provides only a read access to the attribute in the data model. This type of access is useful if the data steward needs to access the information to make a relevant decision but must not change the value, for instance unique identifiers of other elements linked to the entity the steward is viewing, or data that you know is reliable and must not be changed.
Provides no access to the attribute. Hiding an attribute is useful if the information is sensitive and should not be visible by the data steward, financial information for instance. Another example of attributes to be hidden is if the information is just noise for the steward, technical identifier for instance, but need to be propagated as part of the task.
Example
In this example you have only the Nominator role. You want to make the technical identifier invisible to the stewards who are assigned the role and grant them a read access to all other attributes.