Shares of SAP ( SAP) tumbled Thursday after the software maker delivered an unspectacular revenue forecast for the second quarter. SAP sees second-quarter software revenue rising 8% from a year ago to about $789 million and overall revenue rising 9% to about $2.79 billion. The company expects to earn $709 million on a pro forma operating basis in the second quarter. The company backed full-year estimates. Still, the stock fell $3.35, or 6.7%, to $46.99. "With our results in the first half of 2006, we are within our targeted range for product revenue growth, pro forma operating margin growth and pro forma earnings per share," SAP said. "Therefore, we remain confident for the remainder of 2006 as demonstrated by the reaffirmation of our full-year 2006 outlook." "Our order entry is strong and we continue to see a robust pipeline," the company said. "Product launches are moving forward as planned and customer interest in new solutions like mySAP ERP 2005, Duet and SAP Analytics is strong."