SAP BW Professional 
This book, which focuses on Releases 3.0 and 3.1, shows you how to avoid costly mistakes and save countless hours when you optimize key functions and essential processes.
Highlights Include:
- Detailed introduction to SAP BW: InfoObjects, InfoProvider, InfoCubes, Star Scheme, DataSources, InfoSources, Web Items, and a lot more
- SAP BW sample application: rules for transferal and extrapolation, InfoPackages, BEx Query, data collection, and Query-request
- Data modeling: Implementation of a column-oriented Infosource in an account-oriented InfoCube; Illustration of the SAP product hierarchy in data modeling, data collection, and reporting
- Functions of the Query Designers
- Functions of the SAP BW Web Application Designers
- Expandable SAP BW WebCockpit
Reviews
An example: In the "SAP Business Information Warehouse - Overview" section, which supposedly introduces the reader to an overview of SAP BW, under a side heading of "InfoObjects as InfoProviders", you have the following:
Master-data-bearing characteristics as InfoProviders provide reporting with the master data tables of the attributes and texts of the particular characteristics involved".
Besides the fact that this sentence does not make grammatical sense, no attempt has been made to previously define 'master-data-bearing', or to define what master data tables are. It is anyone's guess as to what 'particular characteristics' he is talking about! It also doesn't seem to make sense to have this sentence under a heading of "InfoObjects as InfoProviders"!
Unfortunately, this is not an isolated example! Two sentences before this one reads "Why would you use ODS objects despite all their problems? Because it makes sense to store data at the document level in ODS objects if you think of this storage as a kind of archive that can be directly accessed with key fields that lead to it directly, such as "document number" or "item number." (sic) However, mapping the last requirement with InfoCubes (with line items) offers better performance.
Forgive my ignorance here, but what the hell is the "last requirement" referring to in this sentence?
My advice - Avoid this book!!! For someone who attempts to use this as an introduction to SAP BW it is unreadable and I would imagine that the appalling grammar would make it barely readable for someone who DOES know SAP BW!