Environment:
CA PPM v15.4 and other versions of CA PPM
Answer:
The OBS doesn't have a location assigned under 'Home' -> 'Organization' -> 'Department'. Please go to 'Home' -> 'Organization' -> 'Department' and add the Location(s).
Please also see this section from the CA PPM pdf document:-
Configure an Organizational Breakdown Structure (OBS)
https://docops.ca.com/ca-ppm15-4/en/administration/configure-secure-authentication-user-accounts-and-passwords/configure-an-organizational-breakdown-structure-obs/