Published by Mark Smith-HalvorsenThe euro was down for a fourth day against the yen this morning (April 8th) as concerns about Greece's debt crisis lingered.Speculation that the Mediterranean country will default on its debt obligation continued yesterday as yields on bonds climbed further. Bloomberg reports that the additional investors are demanding an additional yield of 407 basis points for holding ten-year Greek bonds over German bunds."If the negative sentiment around Greece continues to linger, it poses an ongoing negative for risk appetite," said Imre Speizer, a market strategist in Wellington at Westpac Banking Corp, New Zealand's second-largest lender.The single currency also lost ground against the dollar this morning, but gains against the yen were particularly pronounced as the Asian currency outperformed regional competitors amid heavy forex hedging.A raft of positive economic data in Japan was offset by a slump in regional shares this morning which encouraged forex dealers to move out of riskier currencies and return to the haven currency.For more information on foreign exchange treasury services and risk management, visit our Corporate FX site