AppGyver: Basic List component cannot be saved due to "Missing required properties"

Hi community,

I want to access an API and show the result set in a list. To do this, I have added basic list component on my page.

All required properties are assigned resource values. However, "SAVE AND EXIT" button is still disabled.

There are some optional properties which I haven't assigned any value, but can this cause the problem?

Can someone point out, what I am missing?

Best regards,

Mio