Opinion of the European Economic and Social Committee on the ‘Amended proposal for a Directive of the European Parliament and of the Council on certain aspects concerning contracts for the sales of goods, amending Regulation (EC) No 2006/2004 of the European Parliament and of the Council and Directive 2009/22/EC of the European Parliament and of the Council and repealing Directive 1999/44/EC of the European Parliament and of the Council’ (COM(2017) 637 final)