Using one of the search methods described in Searching for Patient Profiles, display the patient profile containing the field you want to unlock on the View/Edit page.
In the EUID tree, select the object in the SBR that contains the field you want to unlock.
Clear the overwrite check box to the left of the field you want to unlock.
Click Commit.
The field is now unlocked and can be edited by updates to system records. The SBR is recalculated by the survivor calculator.