This article explains the AND / OR logic behind Ad Hoc reporting People Scope and Filters.
SuccessFactors Ad Hoc Reporting
Reproducing the Issue
Create a new Ad Hoc report or edit an existing one.
The People pill / People Scope applies 'OR' logic for the filter values chosen within a criterion and applies AND logic between different criteria.
Options selected for a specific field - OR logic between each other.
Different fields selected within the same Filter Group - AND logic between each other
Different Filter Groups - OR logic between each other.
Finally, AND logic is applied between the People Scope and the Filter(s) selected.
Ad Hoc Report
AND OR Logic
Filter Combination , KBA , LOD-SF-ANA-ADH , Adhoc Reports & Report Builder , How To