Bug 142432 MasterPage from library can't be restored to modify
Details: MasterPage from library can't be restored to modify Step: 1.New a library named lib1, and insert a masterpage named lib-mp. 2.Publish the library into resource folder. 3.New a report design and use lib1. 4.Drop the lib-mp from library explorer into outline of report design. 5.Double click lib-mp, and switch to Property editro tab. 6.Click restore. Actual result: Pop up an error message and said that the master page cannot specify size the page type is not custom.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/command/NameCommand.java
DesignElement existedElement = getModule( ).getNameSpace( ns )
					.getElement( name );
			
			
			
			
			if ( existedElement != null )
				throw new NameException( element, name,
						NameException.DESIGN_EXCEPTION_DUPLICATE );
		}
	}
	/**
	 * Adds the element into its name space.
	 * 
	 * @throws NameException
	 *             if the element with the same name exists.
	 */
	protected void addElement( ) throws NameException
	{
		checkName( element.getName( ) );
		addSymbol( );
	}
	/**
	 * Drops the element from its name space.
	 */
	protected void dropElement( )
	{
		dropSymbol( );