2003/242/EC: Commission Decision of 3 April 2003 amending Decision 93/231/EEC, authorising, in respect of the marketing of seed potatoes in all or part of the territory of certain Member States, more stringent measures against certain diseases than are provided for in Annexes I and II to Council Directive 66/403/EEC (Text with EEA relevance) (notified under document number C(2003) 1057)