Dear Rachu:
Kevin is right! The organizational policies do come under the Organizational Process Assets.
To help you understand this better, consider the Organizational Process Assets as something ‘internal’, and the Enterprise Environmental Factors as something ‘external’ to an organization. For example the governmental standards, laws or industry standards come under EEF while the HR Policy, organizational processes and policies etc. come under OPA.
Let me know if this resolves your confusion.
Regards,
Khurram Hussain, PMP, CSSBB