In order to successfully add an Ultimate Holding Company, you would need to create the Ultimate Holding Company as a Contact in CAS360, regardless of if the Company is in your Company Selection Screen or not.
|From the Main Toolbar, go to Contacts|
|Select Global Contacts|
If the company is in your Company Selection screen, tick:
I am trying to enter an ultimate holding company however it will not let me enter the ACN. How do I add an ACN to an Ultimate Holding Company?