Parliamentary Inquiry Commissions (CPIs) are one of the ways the Legislative Power exercises its oversight function. They are created by an Act of the President to investigate a specific fact, upon request of at least one third of the parliamentarians (32). Parliamentary Inquiry Commissions (CPIs) are one of the ways the Legislative Power exercises its oversight function. They are created by an Act of the President to investigate a specific fact, upon request of at least one third of the parliamentarians (32).