http://blog.vsharing.com/zhaodongyang/A933196.html
http://jjwenhuo.itpub.net/post/16092/115296
http://www.fengfly.com/plus/view-174480-1.html SAP BADI的实现1
http://www.fengfly.com/plus/view-174481-1.html SAP BADI的实现2
http://www.fengfly.com/plus/view-174482-1.html SAP BADI的实现3