Excess tds credited.

(A factual example)

For the Qtr 1 F.Y 10-11 , a provision was created on which 10% TDS deducted .For e.g On Rs 100 provision 10% TDS is deducted  ie Rs 10.The client got Rs 10 Credit.But the actual payment turn out to be Rs 80  for which actual tds Turns out to be Rs 8 .Now the Rs 100(Income) has been reflected in client's 26 AS statement along with 10Rs TDS.Client is requesting to amend the return/certificate, such that the income is reflected as Rs 80 as if takes the whole credit of Rs 10 he will have to show income of Rs 100 which is not actual income.His income is Rs 80.Now question whether return/certificate can be changed to reflect in his 26 AS statement income as Rs 80 and TDS as Rs 10.The extra 2 Rs TDS for which client had taken credit will be adjusted in next payment..

The F.Y in which TDS was deducted is F.Y 10-11.Whether it is possible to adopt the above procedure?