In the import Excel format, first few columns contain the details about invoice. If there are multiple line items in the invoice then this information is repeated for every row in Excel file. Since it is basically the same information, it must be same in all rows. Octa GST shows Invoice data not consistent error (e.g. Invoice Value must be same as line no xx) if this data is different in rows of same invoice. To fix this error, please check all columns of invoice information and make sure they are same.