SYMPTOM:
It is not possible to change the Administrator user password from another account that has administrative privileges, for example, when logged in as a user in the System Administrators Group. However, it is possible for a user with administrative privileges to change the password of another user with administrative privileges. If an attempt is made to edit the Administrator user's properties when logged on as another administrative user, the following message appears:

You are not allowed to change this protected property on the Administrator user.
CAUSE:
The original Administrator user that is created with the project has an additional restriction. This user does not allow its password or any other properties to be changed by another user, regardless of privilege.
ACTION:
To change the original Administrator user's password or edit any other properties pertaining to the Administrator user, it is necessary to login as the Administrator user.