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Before you can delete an Office Staff person, you may need to first delete their username from the Agency Office Module . (Agency Office Module>Required tab>Users and Passwords) >With Support's Advice>Users Security (Local Install Only)). If this username has been used to sign in and exists in any session or history records however, this will not be able to be deleted. In this case you will need to make the Office Staff Inactive instead of deleting the relationship.