Hi VENELIN DIMITROV,
Connecting to SAP BusinessObjects is not currently supported.
A list of all of the supported data sources can be found here: http://www.tableausoftware.com/products/desktop/specs
While connecting to SAP BusinessObjects is not officially supported by Tableau, it may be possible to use the Generic ODBC data connection to create a data extract. When using the Generic ODBC connector, it is important to note that success often varies and full compatibility with Tableau features cannot be guaranteed. For more information on using the Generic ODBC connector, you can check out the following KB articles:
Typically, in cases like this I would recommend that you mirror the SAP BO data onto another supported database, such as MySQL or Oracle, and then connect to the mirrored database natively.
-> Also, With Tableau 9.1 you can use Tableau Web Data Connector to connect QaaWS or WebI report directly.
Hope this helps!