SAP is actually an application, not a database engine. SAP runs on many of the database engines that DBForums supports, and we routinely answer SAP database questions in the appropriate database forum.
Because SAP touches so many different aspects of the computing universe, we can't deal with all of it. Like PeopleSoft, JD Edwards, Dynamics, and other ERP products there are database, application server, web server, infrastructure, and many other issues associated with SAP.
SAP is the subject of many forums.
SDN is the official, SAP run forum.
SAP Fans is probably the largest and best known third party forum for SAP. A quick Google search with the appropriate keywords for your problem ought to turn up at least a few other forums that might better address your needs.
-PatP