diff --git a/src/State/Provider/ObjectMapperProvider.php b/src/State/Provider/ObjectMapperProvider.php
index b19d9758b3e..c9170d7a56e 100644
--- a/src/State/Provider/ObjectMapperProvider.php
+++ b/src/State/Provider/ObjectMapperProvider.php
@@ -59,7 +59,7 @@ public function provide(Operation $operation, array $uriVariables = [], array $c
 
         $entityClass ??= $data::class;
 
-        if (!(new \ReflectionClass($entityClass))->getAttributes(Map::class)) {
+        if (!(new \ReflectionClass($operation->getClass()))->getAttributes(Map::class) && !(new \ReflectionClass($entityClass))->getAttributes(Map::class)) {
             return $data;
         }
 
diff --git a/tests/Fixtures/TestBundle/ApiResource/MappedResourceSourceOnly.php b/tests/Fixtures/TestBundle/ApiResource/MappedResourceSourceOnly.php
new file mode 100644
index 00000000000..239cd75a61f
--- /dev/null
+++ b/tests/Fixtures/TestBundle/ApiResource/MappedResourceSourceOnly.php
@@ -0,0 +1,45 @@
+<?php
+
+/*
+ * This file is part of the API Platform project.
+ *
+ * (c) Kévin Dunglas <dunglas@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+declare(strict_types=1);
+
+namespace ApiPlatform\Tests\Fixtures\TestBundle\ApiResource;
+
+use ApiPlatform\Doctrine\Orm\State\Options;
+use ApiPlatform\JsonLd\ContextBuilder;
+use ApiPlatform\Metadata\ApiResource;
+use ApiPlatform\Tests\Fixtures\TestBundle\Entity\MappedEntitySourceOnly;
+use Symfony\Component\ObjectMapper\Attribute\Map;
+
+#[ApiResource(
+    stateOptions: new Options(entityClass: MappedEntitySourceOnly::class),
+    normalizationContext: [ContextBuilder::HYDRA_CONTEXT_HAS_PREFIX => false],
+)]
+#[Map(target: MappedEntitySourceOnly::class)]
+final class MappedResourceSourceOnly
+{
+    #[Map(if: false)]
+    public ?string $id = null;
+
+    #[Map(target: 'firstName', transform: [self::class, 'toFirstName'])]
+    #[Map(target: 'lastName', transform: [self::class, 'toLastName'])]
+    public string $username;
+
+    public static function toFirstName(string $v): string
+    {
+        return explode(' ', $v)[0];
+    }
+
+    public static function toLastName(string $v): string
+    {
+        return explode(' ', $v)[1];
+    }
+}
diff --git a/tests/Fixtures/TestBundle/Entity/MappedEntitySourceOnly.php b/tests/Fixtures/TestBundle/Entity/MappedEntitySourceOnly.php
new file mode 100644
index 00000000000..6e46cd9d66c
--- /dev/null
+++ b/tests/Fixtures/TestBundle/Entity/MappedEntitySourceOnly.php
@@ -0,0 +1,67 @@
+<?php
+
+/*
+ * This file is part of the API Platform project.
+ *
+ * (c) Kévin Dunglas <dunglas@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+declare(strict_types=1);
+
+namespace ApiPlatform\Tests\Fixtures\TestBundle\Entity;
+
+use Doctrine\ORM\Mapping as ORM;
+use Symfony\Component\ObjectMapper\Attribute\Map;
+
+/**
+ * MappedEntity to MappedResource.
+ */
+#[ORM\Entity]
+class MappedEntitySourceOnly
+{
+    #[ORM\Column(type: 'integer')]
+    #[ORM\Id]
+    #[ORM\GeneratedValue(strategy: 'AUTO')]
+    private ?int $id = null;
+
+    #[ORM\Column]
+    #[Map(if: false)]
+    private string $firstName;
+
+    #[Map(target: 'username', transform: [self::class, 'toUsername'])]
+    #[ORM\Column]
+    private string $lastName;
+
+    public static function toUsername($value, $object): string
+    {
+        return $object->getFirstName().' '.$object->getLastName();
+    }
+
+    public function getId(): ?int
+    {
+        return $this->id;
+    }
+
+    public function setLastName(string $name): void
+    {
+        $this->lastName = $name;
+    }
+
+    public function getLastName(): string
+    {
+        return $this->lastName;
+    }
+
+    public function setFirstName(string $name): void
+    {
+        $this->firstName = $name;
+    }
+
+    public function getFirstName(): string
+    {
+        return $this->firstName;
+    }
+}
diff --git a/tests/Functional/MappingTest.php b/tests/Functional/MappingTest.php
index 0665b5acdc2..79522492379 100644
--- a/tests/Functional/MappingTest.php
+++ b/tests/Functional/MappingTest.php
@@ -17,12 +17,14 @@
 use ApiPlatform\Tests\Fixtures\TestBundle\ApiResource\FirstResource;
 use ApiPlatform\Tests\Fixtures\TestBundle\ApiResource\MappedResource;
 use ApiPlatform\Tests\Fixtures\TestBundle\ApiResource\MappedResourceOdm;
+use ApiPlatform\Tests\Fixtures\TestBundle\ApiResource\MappedResourceSourceOnly;
 use ApiPlatform\Tests\Fixtures\TestBundle\ApiResource\MappedResourceWithInput;
 use ApiPlatform\Tests\Fixtures\TestBundle\ApiResource\MappedResourceWithRelation;
 use ApiPlatform\Tests\Fixtures\TestBundle\ApiResource\MappedResourceWithRelationRelated;
 use ApiPlatform\Tests\Fixtures\TestBundle\ApiResource\SecondResource;
 use ApiPlatform\Tests\Fixtures\TestBundle\Document\MappedDocument;
 use ApiPlatform\Tests\Fixtures\TestBundle\Entity\MappedEntity;
+use ApiPlatform\Tests\Fixtures\TestBundle\Entity\MappedEntitySourceOnly;
 use ApiPlatform\Tests\Fixtures\TestBundle\Entity\MappedResourceWithRelationEntity;
 use ApiPlatform\Tests\Fixtures\TestBundle\Entity\MappedResourceWithRelationRelatedEntity;
 use ApiPlatform\Tests\Fixtures\TestBundle\Entity\SameEntity;
@@ -49,6 +51,7 @@ public static function getResources(): array
             MappedResourceWithRelation::class,
             MappedResourceWithRelationRelated::class,
             MappedResourceWithInput::class,
+            MappedResourceSourceOnly::class,
         ];
     }
 
@@ -167,6 +170,52 @@ public function testShouldNotMapWhenInput(): void
         $this->assertJsonContains(['username' => 'test']);
     }
 
+    public function testShouldMapWithSourceOnly(): void
+    {
+        if ($this->isMongoDB()) {
+            $this->markTestSkipped('MongoDB not tested');
+        }
+
+        if (!$this->getContainer()->has('api_platform.object_mapper')) {
+            $this->markTestSkipped('ObjectMapper not installed');
+        }
+
+        $this->recreateSchema([MappedEntitySourceOnly::class]);
+        $manager = $this->getManager();
+
+        for ($i = 0; $i < 10; ++$i) {
+            $e = new MappedEntitySourceOnly();
+            $e->setLastName('A'.$i);
+            $e->setFirstName('B'.$i);
+            $manager->persist($e);
+        }
+
+        $manager->flush();
+
+        $r = self::createClient()->request('GET', '/mapped_resource_source_onlies');
+        $this->assertJsonContains(['member' => [
+            ['username' => 'B0 A0'],
+            ['username' => 'B1 A1'],
+            ['username' => 'B2 A2'],
+        ]]);
+
+        $r = self::createClient()->request('POST', 'mapped_resource_source_onlies', ['json' => ['username' => 'so yuka']]);
+        $this->assertJsonContains(['username' => 'so yuka']);
+
+        $manager = $this->getManager();
+        $repo = $manager->getRepository(MappedEntitySourceOnly::class);
+        $persisted = $repo->findOneBy(['id' => $r->toArray()['id']]);
+        $this->assertSame('so', $persisted->getFirstName());
+        $this->assertSame('yuka', $persisted->getLastName());
+
+        $uri = $r->toArray()['@id'];
+        self::createClient()->request('GET', $uri);
+        $this->assertJsonContains(['username' => 'so yuka']);
+
+        $r = self::createClient()->request('PATCH', $uri, ['json' => ['username' => 'ba zar'], 'headers' => ['content-type' => 'application/merge-patch+json']]);
+        $this->assertJsonContains(['username' => 'ba zar']);
+    }
+
     private function loadFixtures(): void
     {
         $manager = $this->getManager();