Why we have to create logical key at  levels in Hierarchies

hi
i have one doubt that what is the use of logical key at levels in hierarchies directly we can create logical primary key and we can enable for drill down option
what is the use of creating logical key at levels (what i known is that is for unique column in the logical level)
i need small example for this
apart from that why we have to create logical key in logical tables in bmm layer so what is the need of it
Thanks
Sreedhar

hi Sreedhar,
I suggest you to go through
http://download.oracle.com/docs/cd/E12103_01/books/admintool/admintool_BusModSetup20.html#wp1005703
will clarify your doubts :-)
Thanks,
Saichand.v

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