Published by Jamie JemmesonSterling was at $1.6285 in foreign exchange trading yesterday afternoon (July 25th) ahead of today's data about gross domestic product.According to Reuters, the British currency fell from a five-week high of $1.6345 as investors were concerned about the impact negative findings could produce.Bank of Tokyo-Mitsubishi UFJ's currency strategist Lee Hardman said: "The market is looking for close to flat or modest growth but we could see a negative print tomorrow."He added that concerns about the economy would increase if a poor reading is given.Meanwhile, the single currency traded at 88.13 pence, a rise of 0.2 per cent, close to the 21-day moving average 88.85 pence.Forex dealers might be impacted by Moody's decision to slash Greece's credit rating from Ca to Caa1, a three level decline.It noted the country is likely to have debts larger than Gross Domestic Product for a number of years.For more information on foreign exchange treasury services and risk management, visit our Corporate FX site