Hi,
I advise first to go through SAP APO Help on web and also go through Wiki pages for APO.
First it is advisable to understand functionlities in each of the main modeuls like DP, SNP, PPDS, GATP, SPP.
http://help.sap.com/saphelp_scm70/helpdata/en/7e/63fc37004d0a1ee10000009b38f8cf/frameset.htm
Regards
Datta
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