Bug 192083 [regression]DataException when preview attached xtab report.[1102]
data/org.eclipse.birt.report.data.adapter/src/org/eclipse/birt/report/data/adapter/impl/DataRequestSessionImpl.java
null );
	} 
	/**
	 * whether this key name is attribute or not
	 * @param dimensions
	 * @param colName
	 * @return
	 */
	private boolean isAttribute( IDimension dimension, String levelName,
			String colName )
	{
		ILevel[] levels = dimension.getHierarchy( ).getLevels( );
		for ( int j = 0; j < levels.length; j++ )
		{
			if ( !levelName.equals( OlapExpressionUtil.getQualifiedLevelName( dimension.getName( ),
					levels[j].getName( ) ) ) )
				continue;
			String[] attributes = levels[j].getAttributeNames( );
			if ( attributes == null )
				continue;
			for ( int k = 0; k < attributes.length; k++ )
			{
				if ( attributes[k].equals( OlapExpressionUtil.getAttributeColumnName( levels[j].getName( ),
						colName ) ) )
					return true;
			}
		}
		return false;
	}