Bug 121352 The data set binding property cannot be retrieved in report preview layout
In report preview page, the datasource/dataset property binding lists cannot be retrieved. The dataset binding can not work correctly in layout preview because it's value cannot get from the binding list. But in the data set edit page, the binding value can be got. You can refer to the attachment.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/core/DesignElement.java
*            the slot ID to insert
	 * @param defn
	 *            the definition of element to insert
	 * @return false if the module is a library and the element to insert is a
	 *         template element or its content is a template element; or the
	 *         container is report design and slot is component slot and the
	 *         element to insert is a template element or its content is a
	 *         template element; otherwise true
	 */
	private boolean canContainTemplateElement( Module module, int slotID,
			IElementDefn defn )
	{
		
		
		if ( defn != null
				&& defn.isKindOf( MetaDataDictionary.getInstance( ).getElement(
						ReportDesignConstants.TEMPLATE_ELEMENT ) ) )
		{
			
			
			DesignElement container = this;
			int slot = slotID;
			while ( container != null )
			{
				if ( ( container instanceof Module && slot == Module.COMPONENT_SLOT )
						|| container instanceof Library )
					return false;
				slot = container.getContainerSlot( );
				container = container.getContainer( );
			}