Bug 142928 Item from library is changed to a report design item after revert to report item
Details: Item from library is changed to a report design item after revert to report item. Setp: 1.New a template. 2.Use a libary contain a label. 3.Drop the label from library explorer into layout. 4.Change the label to template item. 5.Revert the template item to report item. Actual result: The label is become a report item, but a item from library. Please see the attach image. Exception result: The lable is revert a item from library.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/api/DesignElementHandle.java
*/
	public boolean showError( )
	{
		return hasSemanticError( ) || !isValid( );
	}
	/**
	 * Sets the status that identifies whether the element is valid or not.
	 * 
	 * @param isValid
	 *            the status to set
	 */
	public void setValid( boolean isValid )
	{
		getElement( ).setValid( isValid );
	}
	/**
	 * Justifies whether this element has any semantic error or not.
	 * 
	 * @return true if the element has any semantic error, otherwise false
	 */
	public boolean hasSemanticError( )
	{
		return !getSemanticErrors( ).isEmpty( );
	}
	/**
	 * Deeply clones the current design element which is wrapped by the handle.
	 * 
	 * @return the copy of the design element
	 */
	public IDesignElement copy( )