I tried to configure a new custom treeview. Clicking on the dropdown arrow of the treeview "Order by" button I choose "Custom 1" and would like to configure it. There one can select user defined treeview and in the following window one can select Items (Fields) to sort by. In this list are the database fields with all the custom fields. But it only shows the custom fields from 1-8 not 9 but a second 8 instead.