The following Article 1a is hereby added to Commission Decision 93/536/EEC:
'Article 1a
1. As regards the quantities of butter referred to in Article 1, on request from the interested party, the compensation referred to in that Article shall be equal to the difference between 90 % of the buying-in price expressed in national currency applicable on 30 June 1993, on the one hand, and 90 % of that applicable on the last day of contractual storage on the other.
2. As regards the quantities of butter for which the first day of the contractual storage period is after 30 June 1993, where between that date and the last day of the contractual storage period there is an adjustment of the maximum buying-in price expressed in national currency equal to or greater than 2 %, the compensation referred to in Article 29 of Regulation (EEC) No 685/69 shall be equal to the difference between 90 % of the buying-in price expressed in national currency applicable on the first day of the contractual storage period, on the one hand, and 90 % of that applicable on the last day of the contractual storage period on the other.'