Bug 176450 Support link to CSS Feature(Model Part)
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/command/PropertyCommand.java
{
			checkRecursiveElementReference( memberDefn, (ElementRefValue) value );
		}
		
		
		
		Object oldValue = ref.getLocalValue( module, element );
		if ( oldValue == null && value == null )
			return;
		if ( oldValue != null && value != null && oldValue.equals( value ) )
			return;
		
		ActivityStack stack = getActivityStack( );
		String label = ModelMessages
				.getMessage( MessageConstants.CHANGE_ITEM_MESSAGE );
		stack.startTrans( label );
		makeLocalCompositeValue( ref );
		MemberRecord record = new MemberRecord( module, element, ref, value );
		record.setEventTarget( getEventTarget( ref.getPropDefn( ) ) );
		stack.execute( record );
		Structure structure = ref.getStructure( module, element );
		List semanticList = structure.validate( module, element );
		if ( semanticList.size( ) > 0 )
		{
			stack.rollback( );
			throw (SemanticException) semanticList.get( 0 );
		}
		stack.commit( );
	}
}