Hello and thanks a lot!
I don't have a field like
Is there a way to have several resources without this groupIdField? If I remove that option I get in the console
event-window.js?8c9c:450 Uncaught TypeError: Cannot read property 'id' of undefined
at EventWindow.onDropdownResourceChange (event-window.js?8c9c:450)
Thanks again very much for your help!