Rectification

ONE OF OUR CLIENT FILED INCOME TAX RETURN FOR AY 17-18 ON 28.02.18. UNFORTUNATELY INCOME SHOWN IS 2700000 INSTEAD OF 270000. THERE ARISE A TAX PAYABLE OF RS.800000. HE FILED THE RETURN SHOWING TAX PAYABLE 800000/-. HE DID NOT RESPOND TO INTIMATION U/S 143(1). AFTER THAT NOW HE HAS RECEIVED NOTICE FROM THE INCOME TAX ASSESSING OFFICER. WHEN WE ARE TRYING TO FILE RECTIFICATION OR REVISED RETURN ONLINE, WE GOT A MESSAGE THAT AS THE GROSS TOTAL INCOME VARIES, WE ARE NOT ABLE TO FILE RECTIFICATION. AS PER ASSESSING OFFICER, HE IS NOT ABLE TO RECTIFY THE RETURN AND FORWARD IT TO COMMISSIONER. KINDLY ADVISE ME TO FILE RECTIFICATION TO THE COMMISSIONER