How to show tax details in revised ITR if refund is already credited?

ITR for FY 2020-21 processed and Refund (refund from deducted TDS) credited to bank. But the assessee forgot to show his other sources income and want to file Revise return. Now if he shows his other sources income in revise return obviously he need to pay more tax than previous. Suppose in original Return, Tax Payable 20,000/-, Tax Paid (TDS) 30,000/-, so The refund is 10,000/-. But In revise return Tax Payable 25,000/-, Tax Paid (TDS) 30,000/-, so refund is 5,000/-. Now the question is, as the assessee already got the refund of 10,000/- how can he claim another refund from same TDS amount. Also if he pay Rs. 5,000/- (extra tax amount in revise return) as self assessment tax, his refund amount in revise return will be (5000+5000)= 10,000/-. So, how to show his tax details in Revise ITR?