.
Decision on costs
COSTS
19 THE COSTS INCURRED BY THE COMMISSION OF THE EUROPEAN COMMUNITIES , WHICH HAS SUBMITTED OBSERVATIONS TO THE COURT , ARE NOT RECOVERABLE AND AS THESE PROCEEDINGS ARE , IN SO FAR AS THE PARTIES TO THE MAIN ACTION ARE CONCERNED , IN THE NATURE OF A STEP IN THE ACTION PENDING BEFORE THE NATIONAL COURT , THE DECISION AS TO COSTS IS A MATTER FOR THAT COURT .
Operative part
ON THOSE GROUNDS ,
THE COURT
IN ANSWER TO THE QUESTION REFERRED TO IT BY THE HIGH COURT OF JUSTICE , IRELAND , HEREBY RULES :
ARTICLE 6 OF REGULATION NO 1134/68 IN CONJUNCTION WITH REGULATION NO 756/70 MUST BE UNDERSTOOD TO MEAN THAT THE AMOUNT OF AID FOR SKIMMED MILK PROCESSED INTO CASEIN BEFORE 7 OCTOBER 1974 BUT MARKETED AFTER THAT DATE IS TO BE CALCULATED BY REFERENCE TO THE RATE OF CONVERSION BETWEEN THE IRISH POUND AND THE UNIT OF ACCOUNT APPLICABLE ON THE DATE OF MARKETING .