AP - Germany's SAP AG, the world's largest business-software maker, Monday said it agreed to buy Retek Inc., a maker of retail management software, for $496 million.{br}{br}View the Entire Article (http://us.rd.yahoo.com/dailynews/rss/tech/*http://story.news.yahoo.com/news?tmpl=story2&u=/ap/20050228/ap_on_bi_ge/sap_retek){br}