There isin't a single book that covers all of SCM or even just APO configuration. There are some relatively good books that cover individual modules like DP, SNP, etc. Even then I've yet to find a book that covers 100% configuration for even a single module.
Now if you are looking for a beginners guide to SAP SCM/APO then some of the books you can consider are -
1. Supply Chain Management with SAP APO: Structures, Modeling Approaches and Implementation of SAP SCM 2008 by Jörg Thomas Dickersbach (Springer)
2. SAP SCM: Applications and Modeling for Supply Chain Management (with BW Primer) by Dan Wood (Wiley)
3. Sales and Inventory Planning with SAP APO by Marc Hoppe (SAP Press)
I'm sure there are others and you can easily find them on Amazon/ Google/ SAP Press. Each book (or other knowledge source) gives you just a little bit of what you need to know.
To add to expert Rishi's suggestions, if you are willing to settle for PDF files at no charge, instead of a textbook, there is quite a bit of useful configuration info in SAP's Best Practices.
Of course you need master data for SNP, just like for any other applications.
I'm not familar with external training materials, but I think it's enough to learn from SAP provided materials.
I suggeste SCM230 and online help(http://help.sap.com/saphelp_scm70/helpdata/EN/48/2128546b9033f0e10000000a42189d/frameset.htm).
Please notice that most master data in APO system is transferred from ECC system by CIF.
It'll be a not so easy work to create master data directly in APO system, but if you want, make sure you have the following things: location master, product master, product/location master, resource, transportation lane, PPM/PDS.
Thanks alot Ada.
Can you please provide me with step by step procedure for transfering master data from ECC to APO through CIF.
And also the documentation you provided was helpful but is there anything which has step by step procedure for creating master data in APO. Please answer that would be a great help.
Connectivity (how to enable the core interface)
Replication (how to move Master data from ERP to SCM).
CIF master data is integration area where I'm not expert in. But you can refer to SCM210 instead of 230.
In ECC system, transaction cfm1 and cfm2 can be used to transfer master data (In SNP, we use location, product, resource, BOM) to APO system.
I know that there're many topics in integration, but start from CFM1 and CFM2 may be a good idea.
To use SNP, you may also need to create transportation lane manully in APO with transaction /sapapo/scc_tl1.