Thanks for help Bill.
Field "data lav.ne
" is a date field; I've tried to change its name with no "." and no spaces (now its name is "data_lavor") but does not work. I've tried to do what you suggest but still doesn't work.
What is strange is that in Android version it works great and, when the field "data_lavor" is automatically filled by the trigger in Android version it syncs perfectly to desktop version (I was thinking it could be a date format problem in the trigger or a locale problem).