council decis march conclud intern convent simplif harmon custom procedur accept annex thereto custom warehous eec council european commun regard treati establish european econom commun regard recommend commiss intern convent simplif harmon custom procedur negoti custom cooper council effect contribut develop intern trade accord articl convent contract parti conclud convent accept annex thereto commun accept annex custom warehous convent conclud annex thereto accept decid articl intern convent simplif harmon custom procedur annex thereto custom warehous conclud accept behalf commun text convent annex contain annex decis articl presid council author design person empow sign convent refer articl accept annex refer articl confer power requir bind commun person inform secretari gener custom cooper council applic aforesaid annex custom territori member state european econom commun consid singl territori brussel march council presid ryan