MANILA, Aug 7 - Japanese Finance Minister Masajuro Shiokawa said on Thursday that foreign-exchange rates should reflect a country's economic fundamentals. When asked at a news conference in the Philippine capital whether China should revalue the yuan, Shiokawa said: "What sort of policy a country takes should be based on their individual judgment of what is advantageous, and others should not meddle." Shiokawa was speaking after a two-day meeting of finance ministers from the 10 members of the Association of South East Asian Nations plus Japan, China and South Korea. "Foreign-exchange rates should reflect fundamentals and market principles, and it's not good for countries artificially to maintain levels," he added.