SQL 2008 R2 is now fully supported by SAP - Running SAP Applications on SQL Server - Site Home - MSDN Blogs

SAP have announced full support of SQL 2008 R2

SAP has announced the full General Availability and Unrestricted Support for SQL 2008 R2 as of 16th September 2010. OSS Note 1076022 has been updated with the following text:

SQL Server 2008 R2

SQL 2008 R2 is now fully supported by SAP - Running SAP Applications on SQL Server - Site Home - MSDN Blogs