Empty drop down list, dynamic entry list

Hi,

I've made a drop down list that should be filled via a dynamic entry list. I don't get a list.

When I test the dataservice seperately I do get data.

While setting the dynamic entry list I do miss a button 'add fields', what, according to sap help, has the function to display the fields so that Visual Composer can store them. So I'm guessing VC does not store the data?

I've started VC on several portals, but never get to see this button.

Can anyone help me?

Thanks!