271(1)(c): disclosure after 142(1) / 143(2) can not be said to "voluntary disclosure"

S. 271(1)(c): A disclosure of income, or withdrawal of claim for deduction, by the assessee after a specific s. 142(1)/ 143(2) notice is issued cannot be said to be a "voluntary disclosure" so as to avoid the levy of penalty. The argument that the earlier non-disclosure of income/ wrong claim for expenditure was due to "mistake" is not an acceptable defense (Mak Data 358 ITR 593 (SC) followed, Price Waterhouse Coopers 348 ITR 306 (SC) distinguished)