Target Plus Scheme under EXIM Policy/FTP can't be amended retrospectively to deny already accrued be

EXIM Policy/FTP : Notification No. 48/2005 dated February 20, 2006 and Notification No. 8/2006 dated June 12, 2006 amending 'Target Plus Scheme' under EXIM Policy/Foreign Trade Policy 2004-2009 to restrict/reduce benefit to exporter retrospectively from 1-4-2005 were ultra vires, as already accrued benefit cannot be taken away by retrospective amendment; therefore, the said notifications were read down to be effective only from dates they are issued