Proposal for a Council Decision on the conclusion of an Agreement in the form of an exchange of letters between the European Community and the United States of America relating to the modification of concessions with respect to cereals provided for in Schedule CXL annexed to the GATT 1994 / Proposal for a Council Decision on the conclusion of an Agreement in the form of an exchange of letters between the European Community and Canada pursuant to Article XXVIII of GATT 1994 for the modification of concessio