fter you create a new custom entity, a new set of privileges will appear in the Custom Entities tab of all the security role forms so that you can specify how users can work with your custom entity.

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Your users will not be able to work with your custom entity until you configure the privileges for your users’ security roles.
Custom activities are the exception to this requirement. There are no separate security privileges for custom activity entities, they are included in the security privileges for the activity entity, which is configured under the Core Records tab in the security role form.