详见我的博文“解读SAP清晰新世界”
http://www.csug.org.cn/people/CherryYan/blog/2009/06/20/%E8%A7%A3%E8%AF%BBsap-%E6%B8%85%E6%99%B0%E6%96%B0%E4%B8%96%E7%95%8C
