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.
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