Self Assessment Tax Paid but Forget to mention in ITR

RITESH KUMAR BHAGAT (Student) (110 Points)

14 August 2023  
Dear Sir/Madam/Students,
One of the Client has been paid Self Assessment Tax but forget to mention in ITR-1 and Same has been processed by income tax department.
ITD also not Considered and raised Demand.
What Can I do to resolve this issue?

1. Only give Response from IT portal
or
2. Can I File Updated return? because ITR already Processed.