SAP network forums
The biggest and the most valuable SAP forums, organized into a number of categories related to SAP related products. There are a few categories related to Business Intelligence in SAP environments: SAP Solutions SAP NetWeaver Database & OS Platforms SAP...
https://www.sdn.sap.com/irj/scn/forums

SAP Netweaver
SAPDocs provides information on SAP Netweaver BI downloads, tutorials and guides. The webpage provides tips and tricks on SAP BW, help on SAP Web Application Server and SAP System Configuration Guide(CIN) and much more....
http://sapdocs.info/netweaver/

SAPFans BW forum
SAP Business Warehouse forum on The SAP Fan Club Forums. It is one of the most visited and active forums on the web....
http://www.sapfans.com/forums/viewforum.php?f=16

SAP BW tips and forum
SAP BW Tips and Business Information Warehouse Discussion Forum. The SAP BW forum is divided into the following sections: SAP BW general, certification exam, FAQ, books, comparisons, SAP BW trainings, Infocube information, Reporting capablities, errors,...
http://www.sap-img.com/sap-bw.htm

SAP community network forum
The SAP Data Warehousing forum deals with the topics of integration, transformation, consolidation, cleanup, and storage of data. Includes topics about data modeling, data extraction and administration of the data warehouse management processes or other...
https://www.sdn.sap.com/irj/sdn/forum?forumID=133