What is the result of the pcEnPref flag configured on the epg-App_EPG?

The `pcEnPref` flag defines communication policy for EPGs in a preferred group, not configuration change validation for the private network.

While an L3Out is within a private network, the `pcEnPref` flag's primary effect is on communication between EPGs within the preferred group, not specifically general access control rules for the L3Out network.

The `pcEnPref` flag, when enabled on an EPG, designates that EPG as a member of the Preferred Group for its associated Private Network (VRF). Within the Preferred Group, access control rules are relaxed, allowing unrestricted communication between EPGs that are also members of the same preferred group within that private network without requiring explicit contracts.

The `pcEnPref` flag is a policy setting for communication within a private network, not a mechanism to prevent configuration changes to EPG objects.