Blocked persons
Each mapped field in Source mappings has a Require This Field toggle. For example:
When this toggle is enabled for a mapped field, any Persons with a missing value for the field are blocked from Snapshots (including snapshots generated during Imports). Persons who are already imported (i.e., already in the persons list) are not removed; however, they will not be touched during snapshots as long as they remain blocked.
To get started, Require a field. Subsequently, View blocked persons, or Resolve blocked persons.
When persons are blocked in this way, the rest of the snapshot proceeds normally. Unaffected persons are still processed and included in the persons list.