Swiss Agreement to hide black money

Ram Jethmalani mentioned in RS yesterday that in 2010, GOI has signed a treaty with the Swiss Govt agreeing with them that they will not disclose/take action against any black money in their country prior to 1/4/2011.....now why did GOI  sign it?

( http://www.inewsone.com/2011/05/03/supreme-court-quizzes-government-on-taxation-agreement/47950 )