Value node in enhanced UI-Component not visible under configuration(show available fields)

Hi experts,

I have enhanced an UI component, then I have enhanced a view (details) and set name zbt111_oppt, then I created a new value node (and new attribute) with wizard. Now I want to add this created attribute in UI configuration. The problem is that I can´t see this new value node under "show available fields". there are just the standard nodes. What do I have to do? Do I have miss something? I have copied the config and want to add this field to the copied config, but I can´t see this value node...

Please help.

best regards