Help needed in quoting Capital Gains

1. In AY 2020-21 Form 24AS, I have been reported for SFT for selling our old house of which I received a share. 
2. Since 2019, I had been paying installments to purchase my new Flat whose registration will be done in Feb '21. So CBDT will again report SFT in AY 2021-22 for purchasing my Flat.
My query is:
Should I inform the selling and buying of property (with whatever installment payments done) in Capital Gains section of AY 2020-21 ITR or in the ITR of AY 2021-22 with the full payment amount?
Thanks in advance!