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
return generateHandleList( elementList );
	}
	/**
	 * Returns all parameter handles that this modules.
	 * 
	 * @return all parameter handles that this modules.
	 */
	public List getAllParameters( )
	{
		List elementList = module.getNameSpace( Module.PARAMETER_NAME_SPACE )
				.getElements( );
		return generateHandleList( elementList );
	}
	/**
	 * Generates a list of element handles according to the given element list.
	 * Each content in the return list is generated use
	 * <code>element.getHandle( Module )</code>
	 * 
	 * @param elementList
	 *            a list of elements.
	 * @return a list of element handles.
	 */
	private List generateHandleList( List elementList )
	{
		List handleList = new ArrayList( );
		Iterator iter = elementList.iterator( );
		while ( iter.hasNext( ) )
		{
			DesignElement element = (DesignElement) iter.next( );
			Module root = element.getRoot( );