Bug 146761 All structure properties change can't be restore
Steps to reproduce: 1.New a report, extends lib.table 2.Add a structure property(such as filter, column binding...) on table 3.Choose the table, click "Restore Property" Expected result: Local propery is removed Actual result: Local property can't be removed so that "Restore Property" is always enabled
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/api/GroupPropertyHandle.java
{
	/**
	 * Definition of the property.
	 */
	protected ElementPropertyDefn propDefn = null;
	/**
	 * Handle to a collection of elements.
	 */
	protected GroupElementHandle handle = null;
	/**