diff --git a/src/Entity/Base/AbstractPartsContainingDBElement.php b/src/Entity/Base/AbstractPartsContainingDBElement.php
index 3ea1c216..5d25283e 100644
--- a/src/Entity/Base/AbstractPartsContainingDBElement.php
+++ b/src/Entity/Base/AbstractPartsContainingDBElement.php
@@ -40,9 +40,6 @@ use Symfony\Component\Serializer\Annotation\Groups;
 #[ORM\MappedSuperclass(repositoryClass: AbstractPartsContainingRepository::class)]
 abstract class AbstractPartsContainingDBElement extends AbstractStructuralDBElement
 {
-    /**
-     * @var Collection|ArrayCollection The parameters of this element
-     */
     #[Groups(['full'])]
     protected Collection $parameters;
 
diff --git a/src/Entity/Parts/MeasurementUnit.php b/src/Entity/Parts/MeasurementUnit.php
index d9437469..2b7130c9 100644
--- a/src/Entity/Parts/MeasurementUnit.php
+++ b/src/Entity/Parts/MeasurementUnit.php
@@ -118,7 +118,7 @@ class MeasurementUnit extends AbstractPartsContainingDBElement
 
     #[ORM\ManyToOne(targetEntity: self::class, inversedBy: 'children')]
     #[ORM\JoinColumn(name: 'parent_id')]
-    #[Groups('measurement_unit:read', 'measurement_unit:write')]
+    #[Groups(['measurement_unit:read', 'measurement_unit:write'])]
     #[ApiProperty(readableLink: false, writableLink: false)]
     protected ?AbstractStructuralDBElement $parent = null;