Annx. G. changed. Previously we have to fill invoicewise details but as per new format we have to filled declartion wise details. This New annex has also corrected state spelling. If you can't upload old Form-704 (ver 1.2.1) try new form download from mahavat site from below link.
https://www.mahavat.gov.in/Mahavat/GetDataAction?option=Electronic%20Forms
or goto mahavat site www.mahavat.gov.in >downloads>Forms>New Electronic forms
Though the version is 1.2.1 the annx. g is changed