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Administrators have full read/write access across their entity and any entities beneath them. That means, a business partner administrator, has full access to edit and manage their BP account settings, as well as manage all the configuration and account settings of their customers. Note: This can be restricted using Manage Roles and Access.
Normal Permissions
A normal user only has read permissions, and typically does not have edit permissions. They typically can still access most of the same pages as an administrator, but will not have edit permissions. Some administrative pages are hidden entirely from a normal user.
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