fixes

src/Mapper/PostingApiToEntityMapper.php

@@ -39,13 +39,13 @@ class PostingApiToEntityMapper implements MapperInterface
         } else {
             $user = $this->security->getUser();
             assert($user instanceof User);
-            if ($dto->partner === null) {
+            if ($dto->partnerIri === null) {
                 throw new \Exception('Partner missing');
             }
             $partner = $this->microMapper->map($dto->partnerIri, Partner::class, [
                 MicroMapperInterface::MAX_DEPTH => 1,
             ]);
-            if ($dto->product === null) {
+            if ($dto->productIri === null) {
                 throw new \Exception('Product missing');
             }
             $product = $this->microMapper->map($dto->productIri, Product::class, [