Bug 141709 The Interface "IScalarParameterModel" should provide a "TEXT_ID_PROP" member.
In order to provide the "Localization" function in Property Editor of Parameter, it requires to implement a "ScalarParameterI18nPage" Class similar to the Class of "LabelI18nPage", and it consequently needs to "IScalarParameterModel" provide a "TEXT_ID_PROP" member for "ScalarParameterHandle" Class.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/api/ScalarParameterHandle.java
return null;
		String expr = addColumn.getExpression( );
		if ( expr == null )
			return null;
		List columns = (List) getProperty( BOUND_DATA_COLUMNS_PROP );
		if ( columns == null )
			return (ComputedColumnHandle) getPropertyHandle(
					BOUND_DATA_COLUMNS_PROP ).addItem( addColumn );
		ComputedColumn column = DataBoundColumnUtil.getColumn( columns, expr );
		if ( column != null && !inForce )
		{
			return (ComputedColumnHandle) column.handle(
					getPropertyHandle( BOUND_DATA_COLUMNS_PROP ), columns
							.indexOf( column ) );
		}
		return (ComputedColumnHandle) getPropertyHandle(
				BOUND_DATA_COLUMNS_PROP ).addItem( addColumn );
	}
	/**
	 * Removed unused bound columns from the parameter. Bound columns of nested
	 * elements will not be removed.
	 * 
	 * @throws SemanticException
	 *             if bound column property is locked.
	 */
	public void removedUnusedColumnBindings( ) throws SemanticException
	{
		UnusedBoundColumnsMgr.removedUnusedBoundColumns( this );
	}
}