Changes to 88/303/EEC: Council Decision of 24 May 1988 recognizing certain parts of the territory of the Community as being either officially swine fever free or swine fever free
EU Decision 1988/303
Made by 89/578/EEC: Council Decision of 30 October 1989 amending for the third time Decision 88/303/EEC recognizing certain parts of the territory of the Community as being either officially swine fever free or swine fever free
From legislation.gov.uk's record of changes, the official one: see it there.