ARAS 12 - How to remove "Create New XXX" button ?

オフライン

Hi,

I defined an ItemType named "Cost".
This is a relationship without related item.
There is nothing in the "Can Add" of this ItemType because nobody can create a "Cost". There are only created by code.

In ARAS 12, I have this:

What should I do in CUI to remove "Create New Cost" ?