Bug 168148 [regression]Table with chart from library fails to preview.[01][0001]
Description: Table with chart from library fails to preview. Build number:2.1.2.v20061215 and 2.2.0.v20061213 Steps to reproduce: 1.Create a library, create a sample DB data source and data set: select * from orders 2.Insert a tabel to the library, bind data set to the table 3.Insert a group for the tabel ,group by "row["OrderDate"]", Interval: Year, Range:1 4.Drag a chart into 3rd cell on group row, bar chart, go to "Select Data" tab , bind data set, X Series:row["OrderDate"], Y Series:row["OrderNumger"]; click "Finish" button 5.Create a new report, use the library 6.Drag the table in the library to the report. 7.Preview in html. Expected Result: Report content displays without errors. Actual result: Error happened while running the report.(same for 2.1.2 and 2.2.0) Error log: org.eclipse.birt.report.service.api.ReportServiceException: Error happened while running the report
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/util/ModelUtil.java
*/
	public static Object copyValue( IPropertyDefn propDefn, Object value )
	{
		if ( value == null || propDefn == null )
			return null;
		switch ( propDefn.getTypeCode( ) )
		{
			case IPropertyType.STRUCT_TYPE :
				if ( propDefn.isList( ) )
					return ModelUtil.cloneStructList( (List) value );
				return ( (Structure) value ).copy( );
			case IPropertyType.ELEMENT_REF_TYPE :
			case IPropertyType.STRUCT_REF_TYPE :
				ReferenceValue refValue = (ReferenceValue) value;
				return refValue.copy( );
			case IPropertyType.LIST_TYPE :
				return ModelUtil.clonePropertyList( (List) value );
		}
		return value;
	}
	/**
	 * Copies a list of simple property values.
	 * 
	 * @param value
	 *            the original value to copy
	 * @return the cloned list of simple property values
	 */
	private static Object clonePropertyList( List value )
	{
		if ( value == null )