Merge pull request #672 from akeneo/CPM-736

CPM-736 : Add 422 error code on "Update/create several products"

Author: Beninho

content/swagger/akeneo-web-api.json

@@ -133,3 +133,5 @@ patch:
       $ref: "#/responses/413Error"
     415:
       $ref: "#/responses/415ErrorStream"
+    422:
+      $ref: "#/responses/422Error"