2001/287/EC: Commission Decision of 2 April 2001 recognising in principle the completeness of the dossier submitted for detailed examination in view of the possible inclusion of mesosulfuron methyl in Annex I to Council Directive 91/414/EEC concerning the placing of plant-protection products on the market (Text with EEA relevance) (notified under document number C(2001) 1000)