Reg rectification of trust filed return A.Y. 2020-21

Amaranath (Asst.) (94 Points)

22 October 2021  
one of my friend filed ITR 7 of trust for the A.y. 2020-21, which was registered under 12A and 80G. but during income tax filing, he was not mentioned 12A registration number, now it was deemed nearly 1 lk, how can we rectify the same in New portal