Rectification of return

Hi,

I have received an intimation u/s 143(1) wherein a demand of Rs. 4640 has been raised (for my father's return - Senior citizen).

I had paid the above mentioned amount as self assessment tax. However the same is not reflected in the intimation notice. On checking traces site, I can find the challan. How do I rectify this.

Also in the return I have not claimed deduction of Rs. 50000 towards sec. 80TTB. Can I rectify the same now. My tax liability would have been NIL if I had claimed this amount.

So effectively can I claim the 80TTB deduction and refund for self assessment tax paid erroneously paid.

Regards,