Dear Alessandro,
i have done the same but i am not able to add any fields in sales quote line items through adobe live cycle designer.
this is because ,in easy form editor the table section is missing.
i have done the same issue with the sales order and it is working because the table section is available in easy form editor and i am able to add the fields in my line items through Adobe live Cycle designer too.
for sale quote what i have to do ?
Thanks,
Manoj kannaujiya.