code: public function handle(CommandInterface $command)
      {
          /**
           * @var Stock $stock
           */
          $stock = $command->getPayload();
  
          $variationIdentity = $this->identityService->findOneBy([
              'objectIdentifier' => $stock->getVariationIdentifier(),
              'objectType' => Variation::TYPE,
              'adapterName' => ShopwareAdapter::NAME,
          ]);
  
          if (null === $variationIdentity) {
              $this->logger->notice('could not find variation identity - ' . $stock->getVariationIdentifier());
  
              return false;
          }
  
          $this->identityService->findOneOrCreate(
              $variationIdentity->getAdapterIdentifier(),
              ShopwareAdapter::NAME,
              Stock::TYPE
          );
  
          $variationRespository = $this->entityManager->getRepository(Detail::class);
  
          /**
           * @var null|Detail $variation
           */
          $variation = $variationRespository->find($variationIdentity->getAdapterIdentifier());
  
          if (null === $variation) {
              $this->logger->notice('could not find variation - ' . $stock->getVariationIdentifier());
  
              return false;
          }
  
          $variation->setInStock($stock->getStock());
  
          $this->entityManager->persist($variation);
          $this->entityManager->flush();
          $this->entityManager->clear();
  
          return true;
      }
docs: {@inheritdoc}
  
  @param TransferObjectCommand $command