28. 12. 91 Official Journal of the European Communities No L 357/53 COMMISSION REGULATION (EEC) No 3810/91 of 18 December 1991 laying down detailed rules for the application of the supplementary trade mechanism to trade in the beef and veal sector between the Community as constituted at 31 December 1985 and Spain and Portugal and repealing Regulations (EEC) No 4026/89 and (EEC) No 3815/90. THE COMMISSION OF THE EUROPEAN COMMUNITIES, Having regard to the Treaty establishing the European Economic Community, Having regard to the Act of Accession of Spain and Portugal, and in particular Article 83 and 251 thereof, Having regard to Council Regulation (EEC) No 569/86 of 25 February 1986 laying down general rules for the appli- cation of the supplementary mechanism applicable to trade ('), as amended by Regulation (EEC) No 3296/88 (3, and in particular Article 7 (1) thereof, Having regard to Council Regulation (EEC) No 3792/85 of 20 December 1985 laying down the arrangements applying to trade in agricultural products between Spain and Portugal (*), as amended by Regulation (EEC) No 3296/88, and in particular Article 13 thereof, Whereas Commission Regulations (EEC) No 4026/89 (%), as last amended by Regulation (EEC) No 3125/91 (%), and No 3815/90 (%), as last amended by Regulation (EEC) No 3508/91() set for 1991 the indicative ceilings mentioned in Articles 83 and 251 of the Act of Accession for Spain and Portugal ; whereas these ceilings are set on the basis of estimated Spanish production and consump- tion of the products in question and a forward timetable for trade with the rest of the Community; Whereas Article 5 .of Council Regulation (EEC) No 3792/85 lays down that imports of these products into Portugal from Spain are subject to the supplementary trade mechanism in accordance with Articles 249 to 252 of the Act of Accession ; Whereas, taking into account the development of the Spanish and Portuguese markets, a very large increase in the ceilings is necessary for 1992 in order to advance the process of integration of the said markets with the Community market ; () OJ No L 55, 1. 3. 1986, p. 106. () OJ No L 293, 27. 10. 1988, p. 7. () OJ No L 367, 31. 12. 1985, p. 7. () OJ No L 382, 30. 12. 1989, p. 62. % OJ No L 296, 26. 10. 1991, p. 30. () OJ No L 366, 29. 12. 1990, p. 30. () OJ No L 333, 4. 12. 1991, p. S. Whereas in order to regulate trade more satisfactorily by taking account of the varying level of sensitivity of the Spanish and Portuguese markets at different times of the year, and in particular lower demand in the second and third quarters, the annual quantities should be split up into two-month periods ; Whereas, when laying down the detailed rules for the lodging of the application and the issuing of licences, derogations should be made from Commission Regula- tion (EEC) No 3719/88 of 16 November 1988 laying down common detailed rules for the application of the system of import and export licences and advance fixing certificates for agricultural products (%), as last amended by Regulation (EEC) No 1599/90 (), and from Commission Regulation (EEC) No 574/86 of 28 February 1986 laying down detailed rules for the application of the supplemen- tary trade mechanism ('), as last amended by Regulation (EEC) No 3296/88; Whereas it should be laid down that Community traders may only export certain beef and veal products to Spain and Portugal under certain restrictive conditions regarding in particular the length of time they have been trading ; Whereas, with regard to imports to Portugal from third countries, certain aspects of the arrangements applicable to STM import licences laid down by Regulation (EEC) No 596/86 should be clarified ; whereas, for this purpose, the application of Commission Regulation (EEC) No 2377/80 of 4 September 1980 on special detailed rules for the application of the system of import and export licences in the beef and veal sector (''), as last amended by Regulation (EEC) No 2996/90 (%), and of the other provi- sions regarding the various special import arrangements is the most appropriate for the import arrangements for beef and veal ; Whereas it is desirable, for the sake of clarity, to set out in a new Regulation the detailed rules for the application of the STM in respect of Spain and Portugal and to repeal Regulations (EEC) No 4026/89 and No 3815/90; () OJ No L 331, 2. 12. 1988, p. 1. ) OJ No L 151, 15. 6. 1990, p. 29. (% OJ No L 57, 1. 3. 1986, p. 1. (") OJ No L 241, 13. 9. 1980, p. 5. () OJ No L 286, 18. 10. 1990, p. 17.