Since the product is both a dishwasher and an oven, two labels and two product fiches have to be shown in the web-shop, one for the dishwasher part and one for the oven part (there is no energy label for hobs). If however there is a single product with two functions, such as washer/drier, covered by one regulation, then only one label needs to be displayed.
Disclaimer: Please note that the European Commission cannot provide a legally binding interpretation of the EU legislation, as this is the sole competence of the European Court of Justice. Any remarks from the European Commission services are without prejudice to the position the Commission might take should related cases arise in a procedure before the Court of Justice.