admin wrote:

if your input/select field has an initial value, CSLookup just replace the field with a select field with all items

Thank you for your attention, Luigi.
Your explanation was clear, except on one point refering to my second question.
Maybe I'm a bit stupid, but I did not realize where can I set the parameters of the selected country. I give an example: I applied CSLookup to com_eztestimonial component using one of the available fields of the component for the indication of the country.
My question is: where must I define the parameters for the country I want to select? In CSLookup script? Or directly on the component?
The error is certainly mine, but I don't see how do I get there...
Thanks once more for your patience...

Grazie, Luigi.