useful Tcode:SE18 SE19
http://www.cnblogs.com/libihui422/archive/2010/04/18/1715012.html
http://www.cnblogs.com/libihui422/archive/2010/04/18/1715036.html
http://www.cnblogs.com/libihui422/archive/2010/04/18/1715048.html
one Enhancement Spot can include many BADI,one BADI can only include one Interface,one BADI can include many BADI enhancement Implementation。
and one Enhancement implementation can include BADI enhancement Implementation,one Enhancement Spot can include many Enhancement implementation
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