Commission Regulation (EEC) No 2490/91 of 13 August 1991 amending Regulation (EEC) No 4131/87 of 9 December 1987 determining the conditions of entry of port, Madeira, sherry, Setúbal muscatel and Tokay (Aszu and Szamorodni) wines falling within subheading 2204 21 41, 2204 21 51, 2204 29 41, 2204 29 45, 2204 29 51 and 2204 29 55 of the Combined Nomenclature.