Use the radio buttons to specify whether the list of users available from the standard field are restricted to internal users, external users or both.
===Lookup Roles===
This setting will also work in tandem with the Look-up Scope settings, returning only internal or external users assigned to this role depending on how the Look-up scope is configured.
Checking this box means the contacts that can be selected in the standard field are restricted to those belonging to the organization (and its sub-organizations) selected in the Company standard field at Level 1.
=Organization Standard Field Settings=
As such it is important that the list of available categories includes any Default Look-up Category that is selected.
=See Also=