How to Delete 'Permission Definition' from Functional Structure

I am using 800xA V6.0.3. I accidentally created 'Permission Definition' in Utilities object in my Functional Structure. When i tried to delete it then i got this error "[Error] Domain object 'Utilities' can not be removed from its position in the admin structure.Transaction Cancelled." Its showing in Permissions of System Configuration Console but i am unable to locate it in Admin Structure\Inventory Object\Permissions. Please help me how can i delete this.