Dear All,
There is also the following wiki page, that explains how to solve this type of issue:
http://wiki.scn.sap.com/wiki/display/BI/Common+issues+related+to+DB+Connect
And also the note:
2069563 - Error "Table x does not exist in database system 'XXX'" for DB Connections when trying to create Datasources
Regards,
Janaina