diff --git a/src/Repository/MerServiceRepository.php b/src/Repository/MerServiceRepository.php
index 6f0bd10..133370e 100644
--- a/src/Repository/MerServiceRepository.php
+++ b/src/Repository/MerServiceRepository.php
@@ -65,6 +65,12 @@ class MerServiceRepository extends ServiceEntityRepository
 //        ;
 //    }
 
+    /*
+     * offer_id is in MerDM, a trait used by MerParaDM for example.
+     * This field can't be used in MerService, so the idea is to do
+     * a partial load, and then refresh() the object to get all the
+     * fields.
+     */
     public function findByOfferId(int $offerId)
     {
 //        return $this->createQueryBuilder('s')
@@ -81,7 +87,7 @@ class MerServiceRepository extends ServiceEntityRepository
         $rsm->setDiscriminatorColumn('s', 'discr');
 
         $query = $this->getEntityManager()
-            ->createNativeQuery('SELECT * FROM mer_service m WHERE offer_id = :offer_id', $rsm);
+            ->createNativeQuery('SELECT m.id, m.discr FROM mer_service m WHERE offer_id = :offer_id', $rsm);
         $query->setParameter('offer_id', $offerId);
 
         $res = $query->getResult();
diff --git a/templates/index/notificationDm.html.twig b/templates/index/notificationDm.html.twig
index ac8c6b5..161904e 100644
--- a/templates/index/notificationDm.html.twig
+++ b/templates/index/notificationDm.html.twig
@@ -4,7 +4,7 @@
 
 {% block body %}
     <p>check profiler output</p>
-    
+
     <h1>MerServiceRepository->findByOfferId</h1>
     {{ dump(serviceRepo) }}