code: @OverrideOnDemand
    @Nonnull
    protected ValidationExecutorSetRegistry createValidationRegistry ()
    {
      final ValidationExecutorSetRegistry aVESRegistry = new ValidationExecutorSetRegistry ();
      PeppolValidation.initStandard (aVESRegistry);
      PeppolValidation.initThirdParty (aVESRegistry);
      return aVESRegistry;
    }
docs: Create a new {@link ValidationExecutorSetRegistry} to be used with this
  client builder. By default the {@link PeppolValidation} artefacts are
  contained. If additional artefacts like SimplerInvoicing or EN16931 is to
  be used, this method must be overwritten! This method is only called once
  per client to lazily initialize the respective member variable.
  
  @return The created {@link ValidationExecutorSetRegistry} and never
  <code>null</code>.
  @since 2.0.3