About display overrides

Display overrides enable you to use rights groups to refine user access to individual data items on CRFs. You can control data item access by using the following methods:

User rights—Each of these rights applies to all data items on all CRFs:

A user with this right...	Can...
View CRF	View all items in all CRFs.
Enter Data into a CRF and View CRF	Add data to items that have not had data entered previously. This right is commonly assigned to users in a CRC role. Note that both the Enter Data into a CRF and the View CRF rights must be assigned to enable this access.
Edit Data on a CRF and View CRF	Update data in items in which data has been entered previously. This right is commonly assigned to users in a CRC role. Note that both the Edit Data on a CRF and the View CRF rights must be assigned to enable this access.

Item definition display overrides—The definition of an item includes a Display Override property that enables you to specify whether the item is Hidden, Editable, or Read-Only. Each of these definitions overrides for a single item the access conferred by the View CRF, Enter Data into a CRF, and Edit Data on a CRF rights.
Therefore, a user in a rights group with the View CRF and Enter Data into a CRF rights would be unable to see an item defined with the Hidden Display Override property and would be unable to enter data in an item defined with the Read-Only Display Override property.

For details about the Display Override property, see Defining item properties.
Rights group display overrides—With rights group display overrides, you can create groups of items and specify whether they are Read-Only, Editable, or Hidden. Each of these specifications overrides for all items in the item group the access conferred by membership in a rights group and the access conferred by the definition of an item-level display override. This additional level of security enables you to give users with the same set of rights different access to specific items.