Erasing initial losses, the Sensex at the Bombay Stock Exchange was trading 50 points up at 16,052 in afternoon deals.The 30-share BSE index, which had gained 132 points in the previous session, had declined by 65 points, or 0.41 per cent, to 15,937 in opening trade today.In a similar fashion, the wide-based National Stock Exchange Nifty index was trading 18 points up at 4,819.