Revision of return after return processed.

Pushpraj (student) (186 Points)

24 May 2021  
Can we revise return after the return has been "processed" & intimation u/s 143(1) has received for FY 19-20 ie AY 20-21??
And if not, then Pls suggest the way to claim the amount of deduction which was not been able to claim in return.