Changes made by Regulation (EEC) No 1957/89 fixing for the 1989/90 marketing year the minimum price to be paid to producers…
EU Regulation No 1957/1989
No changes made by Regulation (EEC) No 1957/89 fixing for the 1989/90 marketing year the minimum price to be paid to producers… are recorded.
From legislation.gov.uk's record of changes, the official one: see it there.