The BSE benchmark Sensex declined by 103 points in early trade today as funds and retail investors booked profits ahead of RBI's monetary policy review later in the day.The 30-share barometer, which had gained over 773 points in the past four sessions, declined by 103.08 points to 17,816.22 with all the sectoral indices, led by realty and metals, falling by up to 1.78 per cent.The wide-based National Stock Exchange Nifty index also moved down by 26.95 points to 5,436.50.In Asia, Hong Kong's Hang Seng was down 0.02 per cent, while Japan's Nikkei rose by 0.62 per cent in earlytrade today.