HCM - Person Security Profile using AOR and combined Scope of Responsibility

Summary

of Business Unit and country

Content

Hi - I am creating a Person Security Profile securing using Area of Responsibilities, and want the user who has this profile assigned in their role to be able to search for person records within specified countries but to exclude persons in those countries who are in a specific Business Unit. 

I have used the Scope of Responsibility that seems to combine both areas I want "Business unit and country", and I have created an Exclusion Rule for the Business Unit I don't want them to see, but when I Preview the Person Security Profile as the user concerned it is returning zero person records. If I change the Scope of Responsibility to either country OR business unit then Preview returns person results.