Bug 191155 Cross table that exoport to library is invalid
Description: Cross table that exoport to library is invalid Step: 1.New a report, new a datasource, dataset and date cute. 2.Insert a cross table and binding the data cute. 3.Drop the dimensions and measures into cross table. 4.Export the report to library 5.New another report and use the library 6.Drop the cross table from library into layout 7.Preview Actual result: The cross table is invalid and pop up the error
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/api/util/ElementExporter.java
*            library will be overriden.
	 * 
	 * @throws SemanticException
	 *             if error encountered when adding this structure to target
	 *             library or duplicating member value from the given structure.
	 */
	void exportStructure( StructureHandle structToExport, boolean canOverride )
			throws SemanticException
	{
		String structName = structToExport.getDefn( ).getName( );
		String nameMemberName = null;
		Structure newStruct = null;
		PropertyHandle newPropertyHandle = null;
		if ( EmbeddedImage.EMBEDDED_IMAGE_STRUCT.equals( structName ) )
		{
			nameMemberName = EmbeddedImage.NAME_MEMBER;
			newStruct = StructureFactory.createEmbeddedImage( );
			newPropertyHandle = targetLibraryHandle
					.getPropertyHandle( IModuleModel.IMAGES_PROP );
		}
		else if ( CustomColor.CUSTOM_COLOR_STRUCT.equals( structName ) )
		{
			nameMemberName = CustomColor.NAME_MEMBER;
			newStruct = StructureFactory.createCustomColor( );
			newPropertyHandle = targetLibraryHandle
					.getPropertyHandle( IModuleModel.COLOR_PALETTE_PROP );
		}
		else if ( ConfigVariable.CONFIG_VAR_STRUCT.equals( structName ) )
		{
			nameMemberName = ConfigVariable.NAME_MEMBER;