A CERTIFICATE SHALL BE CONSIDERED VALID IF , DURING THE PERIOD BETWEEN ITS ISSUE AND THE RELEASE OF THE PRODUCTS FOR FREE CIRCULATION IN THE COMMUNITY , THE FREE-AT-FRONTIER VALUE TO BE COMPLIED WITH HAS BEEN CHANGED , ON CONDITION THAT :
( A ) THE FREE-AT-FRONTIER PRICE INDICATED IN THE CERTIFICATE IS AT LEAST EQUAL TO THE FREE-AT-FRONTIER VALUE APPLICABLE ON THE DAY OF ISSUE ;
( B ) THE CERTIFICATE WAS ISSUED NOT MORE THAN ONE MONTH IN ADVANCE OF THE CHANGE IN THE FREE-AT-FRONTIER VALUE . '
ARTICLE 2
THIS REGULATION SHALL ENTER INTO FORCE ON THE 15TH DAY FOLLOWING ITS PUBLICATION IN THE OFFICIAL JOURNAL OF THE EUROPEAN COMMUNITIES .
HOWEVER , AT THE REQUEST OF THE PARTY CONCERNED , IT SHALL ALSO APPLY TO CERTIFICATES PRESENTED TO THE CUSTOMS AUTHORITIES ON OR AFTER 1 JUNE 1980 .
THIS REGULATION SHALL BE BINDING IN ITS ENTIRETY AND DIRECTLY APPLICABLE IN ALL MEMBER STATES .
DONE AT BRUSSELS , 26 JUNE 1980 .
FOR THE COMMISSION
FINN GUNDELACH
VICE-PRESIDENT