ref

application/Espo/Core/Mail/Importer/DefaultImporter.php

@@ -172,7 +172,7 @@ class DefaultImporter implements Importer
         $parentFound = $this->parentFinder->find($email, $message);
 
         if ($parentFound) {
-            $email->setParent(LinkParent::createFromEntity($parentFound));
+            $email->setParent($parentFound);
         }
 
         if (!$duplicate) {

application/Espo/Core/ORM/Entity.php

@@ -33,6 +33,7 @@ use Espo\Core\Field\Link;
 use Espo\Core\Field\LinkParent;
 use Espo\Core\ORM\Defs\AttributeParam;
 use Espo\ORM\BaseEntity;
+use Espo\ORM\Entity as OrmEntity;
 use Espo\ORM\Name\Attribute;
 use Espo\ORM\Query\Part\Order;
 use Espo\ORM\Type\AttributeType;
@@ -640,7 +641,7 @@ class Entity extends BaseEntity
     /**
      * @since 9.0.0
      */
-    protected function setRelatedLinkOrEntity(string $relation, Link|LinkParent|Entity|null $related): static
+    protected function setRelatedLinkOrEntity(string $relation, Link|LinkParent|OrmEntity|null $related): static
     {
         if ($related instanceof Entity || $related === null) {
             $this->relations->set($relation, $related);

application/Espo/Entities/Email.php

@@ -36,7 +36,9 @@ use Espo\Core\ORM\Entity;
 use Espo\Core\Field\DateTime;
 use Espo\Core\Field\LinkParent;
 use Espo\Core\Field\Link;
+use Espo\Modules\Crm\Entities\Account;
 use Espo\ORM\Collection;
+use Espo\ORM\Entity as OrmEntity;
 use Espo\Repositories\Email as EmailRepository;
 use Espo\Tools\Email\Util as EmailUtil;
 
@@ -651,24 +653,14 @@ class Email extends Entity
         return $this->getValueObject(Field::PARENT);
     }
 
-    public function setAccount(?Link $account): self
+    public function setAccount(Link|Account|null $account): self
     {
-        $this->setValueObject('account', $account);
-
-        return $this;
+        return $this->setRelatedLinkOrEntity('account', $account);
     }
 
-    public function setParent(LinkParent|Entity|null $parent): self
+    public function setParent(LinkParent|OrmEntity|null $parent): self
     {
-        if ($parent instanceof LinkParent) {
-            $this->setValueObject(Field::PARENT, $parent);
-
-            return $this;
-        }
-
-        $this->relations->set(Field::PARENT, $parent);
-
-        return $this;
+        return $this->setRelatedLinkOrEntity(Field::PARENT, $parent);
     }
 
     public function getStatus(): ?string

application/Espo/Modules/Crm/Classes/RecordHooks/Case/AfterCreate.php

@@ -30,7 +30,6 @@
 namespace Espo\Modules\Crm\Classes\RecordHooks\Case;
 
 use Espo\Core\Acl;
-use Espo\Core\Field\LinkParent;
 use Espo\Core\Record\Hook\SaveHook;
 use Espo\Entities\Email;
 use Espo\Modules\Crm\Entities\CaseObj;
@@ -63,7 +62,7 @@ class AfterCreate implements SaveHook
             return;
         }
 
-        $email->setParent(LinkParent::createFromEntity($entity));
+        $email->setParent($entity);
 
         $this->entityManager->saveEntity($email);
     }

application/Espo/Repositories/Email.php

@@ -434,11 +434,10 @@ class Email extends Database implements
         }
 
         if ($accountId) {
-            /** @var ?Account $account */
-            $account = $this->entityManager->getEntityById(Account::ENTITY_TYPE, $accountId);
+            $account = $this->entityManager->getRDBRepositoryByClass(Account::class)->getById($accountId);
 
             if ($account) {
-                $entity->setAccount(Link::create($accountId, $account->getName()));
+                $entity->setAccount($account);
             }
         }
     }