'MailingEventUnsubscribe',
'MailingJob',
'MembershipPayment',
- 'Note',
'SavedSearch',
'UFJoin',
'UFField',
'GroupContact',
'EntityTag',
'PledgePayment',
- 'PaymentProcessorType',
'Relationship',
- 'RelationshipType',
// ones that are not real entities hence not extendable.
'ActivityType',