/**
  * And item relation
  *
  * @param ItemInterface $item
  * @param string $relatedBlockIdentifier
  * @return $this
  */
 public function addItemRelation(ItemInterface $item, $relatedBlockIdentifier)
 {
     if ($this->currentProcessor) {
         $this->currentProcessor->addItemRelation($item, $relatedBlockIdentifier);
     }
     return $this;
 }