[Link] Enhancement Framework

NetWeaver 2004s 之後的 Enhancement Framework，值得參考的入門文件：

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INTRODUCING THE ENHANCEMENT FRAMEWORK: 
THE COOL NEW WAY TO ENHANCE YOUR ABAP SYSTEMS 
http://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/bb54c452-0801-0010-0e84-a653307fc6fc