All directors of a company, registered Australian body, registered foreign company or Aboriginal and Torres Strait Islander corporation will need a director ID. A director identification number (director ID) is a unique identifier you will keep forever. It will help to prevent the use of false or fraudulent director identities.
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As the DirectorId is a lifetime thing there is no need for it to have an expiry date field so just a field in the people list would be fine but it should have a dedicated field as it will form part of the onboarding/appointment process ensuring that board members have all required "qualifications" necessary for their appointment.