Dear Balajee
topic is discussed often in this FORUM. There are some standard OSS notes available. Accordoing to my knowledge: there are some "new" ones regarding that topic.
Generally: anything is "delivered" in client 000. If you follow. e.g. Best Practise (or use OSS note reference) it is explained how you can get the classes fomr e.g. client 000 to XXX (which is not 000 normally).
Other OSS notes regarding this topic are mentioned in some threads.
E.g. check:
http://scn.sap.com/docs/DOC-41109
to a certain extent:
http://scn.sap.com/thread/3399960
http://scn.sap.com/thread/3360067
http://scn.sap.com/thread/2135535 could be of interest. The same: http://scn.sap.com/thread/3328397
C.B.
PS: further links:
http://sapehstrainer.blogspot.de/2009/02/missing-value-assignments-under.html
http://www.stechno.net/sap-notes.html?view=sapnote&id=397204