diff --git a/src/Normalizer/JsonApiDocumentTopLevelNormalizer.php b/src/Normalizer/JsonApiDocumentTopLevelNormalizer.php
index 0b41751..189a64b 100644
--- a/src/Normalizer/JsonApiDocumentTopLevelNormalizer.php
+++ b/src/Normalizer/JsonApiDocumentTopLevelNormalizer.php
@@ -102,7 +102,7 @@ public function denormalize($data, $class, $format = NULL, array $context = [])
 
         // Work out the correct entity type ID from the relationship 'type'
         // value.
-        if (strpos($relationship['data']['type'], '--')) {
+        if (strpos($relationship['data'][0]['type'], '--') !== FALSE) {
           list($entity_type_id,) = explode('--', $relationship['data'][0]['type']);
         }
 
@@ -110,19 +110,25 @@ public function denormalize($data, $class, $format = NULL, array $context = [])
         // is being used.
         else {
           $resource_type = $this->currentContext->getResourceType();
+          $bundle_id = $resource_type->getBundle();
           $type_id = $resource_type->getEntityTypeId();
           // Compare the original with what is contained by the request data
           // and replace the type with the original if necessary.
-          if ($entity_type_id !== $type_id) {
+          if ($relationship['data'][0]['type'] == $bundle_id) {
             $entity_type_id = $type_id;
           }
+          else {
+            $entity_type_id = $relationship['data'][0]['type'];
+          }
         }
+
         try {
           $entity_storage = $this->entityTypeManager->getStorage($entity_type_id);
         }
         catch (PluginNotFoundException $e) {
           throw new BadRequestHttpException("Invalid type specified for related resource: '" . $relationship['data'][0]['type'] . "'");
         }
+
         // In order to maintain the order ($delta) of the relationships, we need
         // to load the entities and explore the uuid value.
         $related_entities = array_values($entity_storage->loadByProperties(['uuid' => $id_list]));