++++ Agriculture ° Common organization of the markets ° Export refunds ° Variable refund ° Conditions for granting ° Importation of the product into the country of destination ° Rules on proof ° Customs entry certificate ° Restricted probative force (Regulation No 885/68 of the Council, Arts 4 and 6(2); Commission Regulation No 2730/79, Art. 20(1) and (3))