Revised Return

I had filed my dad's regular return on 25/12/2020 for the AY 2020-2021 and now I had detected some error in filling. Can I file my revised return now by correcting the amount in the column Gross Turnover or Gross receipts due to the typo error. If so under what head as the online filling is accepting only under section 119(2)b. The return filed on 25/12/2020 is yet to be assessed and pending