Commission Regulation (EC) No 1057/98 of 20 May 1998 amending Regulation (EC) No 122/98 on managing the ceilings for imports of fresh and processed sour cherries originating in the Republics of Bosnia-Herzegovina and Croatia and Regulation (EC) No 123/98 on managing the ceilings for imports of fresh and processed sour cherries originating in the former Yugoslav Republic of Macedonia