Bug 153853 [Regression]The bound column names must be unique within the entire table.
Regression case Regression_136421(under org.eclipse.birt.report.tests.model) failed. Expected result: Model will avoid adding a duplicate bound column name within a table.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/api/ModuleHandle.java
DesignElement element = module.findElement( name );
		if ( element == null )
			return null;
		return element.getHandle( element.getRoot( ) );
	}
	/**
	 * Finds the image with the given name.
	 * 
	 * @param name
	 *            the image name
	 * @return embedded image with the given name. Return <code>null</code>,
	 *         if not found.
	 */
	public EmbeddedImage findImage( String name )
	{
		return module.findImage( name );
	}
	/**
	 * Finds the config variable with the given name.
	 * 
	 * @param name
	 *            the variable name
	 * @return the config variable with the given name. Return <code>null</code>,
	 *         if not found.
	 */
	public ConfigVariable findConfigVariable( String name )
	{
		return module.findConfigVariabel( name );
	}
	/**