Hello everyone,
I followed step by step the right procedure:
1. Create surface from GIS data
2. Data source type: SHP - I selected the shp file from my library and then I selected "login" - I flagged the shapefile and I can check that the shapefile is assigned with the right coordinate system
3. I removed flag on "define area of interest"
4. I assigned the elevation Civil3DProperty to the right GIS field
But when I click on "finish", it pops up an error "NO GIS DATA TO IMPORT": I can import the shapefile to ArcGis without any problem, so it isn't a shapefile problem
I don't know what to do.. thank you for listening to me,
Giulia