The total of the assessable value and the tax amount appears as the Total Value in HSN/SAC Summary. It does not include the values of additional ledgers not enabled for GST.
The Invoice Amount in the GSTR-1 return format view considers the assessable value and the tax amount, along with additional ledgers not enabled for GST. Hence, the Total Value in HSN/SAC Summary will not match the Invoice Amount in the GSTR-1 return format.