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/elements/ReportItem.java
/*******************************************************************************
 * Copyright (c) 2004 Actuate Corporation.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *  Actuate Corporation  - initial API and implementation
 *******************************************************************************/
package org.eclipse.birt.report.model.elements;
import java.util.List;
import org.eclipse.birt.report.model.api.validators.ElementReferenceValidator;
import org.eclipse.birt.report.model.core.DesignElement;
import org.eclipse.birt.report.model.core.Module;
import org.eclipse.birt.report.model.core.PropertySearchStrategy;
import org.eclipse.birt.report.model.core.StyledElement;
import org.eclipse.birt.report.model.elements.interfaces.IReportItemModel;
import org.eclipse.birt.report.model.elements.strategy.ReportItemPropSearchStrategy;
import org.eclipse.birt.report.model.metadata.ElementRefValue;
/**
 * Base class for all report items. Represents anything that can be placed in a
 * layout container. Items have a size and position that are used in some of the
 * containers.
 * 
 */
public abstract class ReportItem extends StyledElement