To administer Single Source of Truth:
Define and update display rules for Organization Profile and Person Profile entities. See: Setting Up Display Rules.
If the display method is Rank, you can define source system overwrite rules for the same attributes that you define display rules for.
For display rules changes to take effect, you must run the Third Party Data Integration Update program. You can run the program immediately after defining display rules, or submit the program at any time. See: Third Party Data Integration Update Program.
Define and update user overwrite rules. See: Setting Up User Overwrite Rules.