Report to outstanding demand

I paid the self assessment tax before filing ITR and entered the challan 280 details in ITR form (IT details). But I missed to click the refresh button in tax details tab of ITR form which resulted in total self assessment tax paid amount as 0. So, the total tax payable is not 0. I have submitted the ITR form with some amount in tax payable.


Now I got the outstanding demand notice from CPC. what should I do?