diff --git a/application/Espo/Core/Action/Actions/Merge/Merger.php b/application/Espo/Core/Action/Actions/Merge/Merger.php
index a9f5fb71bb..f779920cac 100644
--- a/application/Espo/Core/Action/Actions/Merge/Merger.php
+++ b/application/Espo/Core/Action/Actions/Merge/Merger.php
@@ -46,6 +46,7 @@ use Espo\ORM\Entity;
 use Espo\Entities\EmailAddress;
 use Espo\Entities\PhoneNumber;
 
+use Espo\ORM\Type\RelationType;
 use stdClass;
 
 class Merger
@@ -255,14 +256,24 @@ class Merger
 
     private function updateRelations(Entity $sourceEntity, Entity $targetEntity, string $link): void
     {
+        $entityType = $sourceEntity->getEntityType();
+
+        $columnAttributeMap = $this->getLinkColumnAttributeMap($entityType, $link);
+
         $collection = $this->entityManager
             ->getRelation($sourceEntity, $link)
             ->find();
 
         foreach ($collection as $relatedEntity) {
+            $map = null;
+
+            if ($columnAttributeMap) {
+                $map = array_map(fn ($attribute) => $relatedEntity->get($attribute), $columnAttributeMap);
+            }
+
             $this->entityManager
                 ->getRelation($targetEntity, $link)
-                ->relate($relatedEntity);
+                ->relate($relatedEntity, $map);
         }
     }
 
@@ -385,4 +396,35 @@ class Merger
             }
         }
     }
+
+    /**
+     * @return ?array<string, string>
+     */
+    private function getLinkColumnAttributeMap(string $entityType, string $link): ?array
+    {
+        $entityDefs = $this->entityManager
+            ->getDefs()
+            ->getEntity($entityType);
+
+        $columnAttributeMap = null;
+
+        $relationDefs = $entityDefs->tryGetRelation($link);
+
+        if (
+            $relationDefs &&
+            $relationDefs->getType() === RelationType::MANY_MANY &&
+            $relationDefs->hasForeignEntityType() &&
+            $relationDefs->hasForeignRelationName()
+        ) {
+            $foreignRelationDefs = $this->entityManager
+                ->getDefs()
+                ->getEntity($relationDefs->getForeignEntityType())
+                ->getRelation($relationDefs->getForeignRelationName());
+
+            /** ?@var array<string, string> $columnAttributeMap */
+            $columnAttributeMap = $foreignRelationDefs->getParam('columnAttributeMap');
+        }
+
+        return $columnAttributeMap;
+    }
 }
diff --git a/tests/integration/Espo/Actions/ActionTest.php b/tests/integration/Espo/Actions/ActionTest.php
index da96aca66a..e7e8f0012e 100644
--- a/tests/integration/Espo/Actions/ActionTest.php
+++ b/tests/integration/Espo/Actions/ActionTest.php
@@ -38,9 +38,11 @@ use Espo\Core\Field\EmailAddress;
 use Espo\Core\Field\PhoneNumber;
 use Espo\Core\ORM\EntityManager;
 
+use Espo\Modules\Crm\Entities\Account;
 use Espo\Modules\Crm\Entities\Contact;
+use tests\integration\Core\BaseTestCase;
 
-class ActionTest extends \tests\integration\Core\BaseTestCase
+class ActionTest extends BaseTestCase
 {
     /** @var Application */
     private $app;
@@ -273,6 +275,47 @@ class ActionTest extends \tests\integration\Core\BaseTestCase
         );
     }
 
+    public function testMergeRelationshipColumns(): void
+    {
+        $em = $this->getEntityManager();
+
+        $account = $em->getRDBRepositoryByClass(Account::class)->getNew();
+        $accountSource = $em->getRDBRepositoryByClass(Account::class)->getNew();
+        $contact = $em->getRDBRepositoryByClass(Contact::class)->getNew();
+
+        $em->saveEntity($account);
+        $em->saveEntity($accountSource);
+        $em->saveEntity($contact);
+
+        $em->getRelation($accountSource, 'contacts')
+            ->relate($contact, [
+                'role' => 'Tester',
+                'isInactive' => true,
+            ]);
+
+        $merger = $this->getInjectableFactory()->create(Merger::class);
+
+        /** @noinspection PhpUnhandledExceptionInspection */
+        $merger->process(
+            new Params(Account::ENTITY_TYPE, $account->getId()),
+            [$accountSource->getId()],
+            (object) []
+        );
+
+        $em->refreshEntity($account);
+
+        $relation = $em->getRelation($account, 'contacts');
+
+        $this->assertEquals(
+            'Tester',
+            $relation->getColumn($contact, 'role')
+        );
+
+        $this->assertTrue(
+            $relation->getColumn($contact, 'isInactive')
+        );
+    }
+
     public function testMergeNoEditAccess(): void
     {
         $this->createUser('tester', [