Scenario
A user with a custom role is unable to edit the Employee record of an Administrator and encounters the error: "For security reasons, only an administrator is allowed to edit an administrator record."
Solution
It is highly recommended that the user reach out to their Administrator to update the Employee record since it is only editable by another user with an Administrator role.
Note: Assigning the Administrator role to another user grants them full access to the whole account, so it is highly discouraged unless it has been discussed internally and approval has been given based on the company's access/control policies.