I am trying to connect to Mondrian through XMLA from MS excel using SimbaO2X drivers, I succeeded with initial connection and I could see Cubes as well but when I select a cube to form Pivot table it gives me a eroror:
Fault String: XMLA Discoverer unparse results error

When I checked Pentaho log i could see error: mondrian.olap.MondrianException: Mondrian Error:Internal error: Unknown database 'SteelWheels' but I can use the same cube in Pentaho user console using Analyzer

I searched all over but could not find a solution, I feel we need to define something very specific to XMLA in datasource.xml of Pentaho, for reference here my datasource.xml entry for SteelWheels catalog:
<DataSourceDescription>Pentaho BI Platform Datasources</DataSourceDescription>
<Catalog name="SteelWheels">