What happens when the Primary Person ID and Secondary Person ID Special Use Type properties...

A mapping is created between the Primary Person within a position and Secondary Person(s) within that position.

A Lookup is created in the Lookup tab to join tables with Primary Person ID to a Secondary Person ID(s).

A mapping is created between an employee's identifier and the employee's assignment(s).

A relationship is defined for a parent (primary)/child (secondary) relationship for a supervisor structure.