diff --git a/lib/Alchemy/Phrasea/Collection/Reference/ArrayCacheCollectionReferenceRepository.php b/lib/Alchemy/Phrasea/Collection/Reference/ArrayCacheCollectionReferenceRepository.php
index a97f47e043..17a9a1d790 100644
--- a/lib/Alchemy/Phrasea/Collection/Reference/ArrayCacheCollectionReferenceRepository.php
+++ b/lib/Alchemy/Phrasea/Collection/Reference/ArrayCacheCollectionReferenceRepository.php
@@ -90,6 +90,15 @@ class ArrayCacheCollectionReferenceRepository implements CollectionReferenceRepo
         return null;
     }
 
+    /**
+     * @param array|null $subset
+     * @return CollectionReference[]
+     */
+    public function findHavingOrderMaster(array $subset = null)
+    {
+        return $this->repository->findHavingOrderMaster($subset);
+    }
+
     /**
      * @param CollectionReference $reference
      * @return void
diff --git a/lib/Alchemy/Phrasea/Collection/Reference/CollectionReferenceRepository.php b/lib/Alchemy/Phrasea/Collection/Reference/CollectionReferenceRepository.php
index 72b6ad4d40..d40e827f76 100644
--- a/lib/Alchemy/Phrasea/Collection/Reference/CollectionReferenceRepository.php
+++ b/lib/Alchemy/Phrasea/Collection/Reference/CollectionReferenceRepository.php
@@ -36,6 +36,14 @@ interface CollectionReferenceRepository
      */
     public function findByCollectionId($databoxId, $collectionId);
 
+    /**
+     * Find Collection references having at least one Order Master
+     *
+     * @param array<int>|null $subset Restrict search to a subset of base ids.
+     * @return CollectionReference[]
+     */
+    public function findHavingOrderMaster(array $subset = null);
+
     /**
      * @param CollectionReference $reference
      * @return void
diff --git a/lib/Alchemy/Phrasea/Collection/Reference/DbalCollectionReferenceRepository.php b/lib/Alchemy/Phrasea/Collection/Reference/DbalCollectionReferenceRepository.php
index 67e01582e7..68026bd087 100644
--- a/lib/Alchemy/Phrasea/Collection/Reference/DbalCollectionReferenceRepository.php
+++ b/lib/Alchemy/Phrasea/Collection/Reference/DbalCollectionReferenceRepository.php
@@ -10,7 +10,6 @@
 
 namespace Alchemy\Phrasea\Collection\Reference;
 
-use Alchemy\Phrasea\Core\Database\QueryBuilder;
 use Doctrine\DBAL\Connection;
 
 class DbalCollectionReferenceRepository implements CollectionReferenceRepository
@@ -107,6 +106,29 @@ class DbalCollectionReferenceRepository implements CollectionReferenceRepository
         return null;
     }
 
+    public function findHavingOrderMaster(array $subset = null)
+    {
+        $query = self::$selectQuery
+            . ' WHERE EXISTS(SELECT 1 FROM basusr WHERE basusr.order_master = 1 AND basusr.base_id = bas.base_id)';
+
+        $parameters = [];
+        $types = [];
+
+        if (null !== $subset) {
+            if (empty($subset)) {
+                return [];
+            }
+
+            $query .= ' AND bas.base_id IN (:subset)';
+            $parameters['subset'] = $subset;
+            $types['subset'] = Connection::PARAM_INT_ARRAY;
+        }
+
+        $rows = $this->connection->fetchAll($query, $parameters);
+
+        return $this->createManyReferences($rows);
+    }
+
     public function save(CollectionReference $collectionReference)
     {
         $query = self::$insertQuery;
diff --git a/lib/Alchemy/Phrasea/Core/Provider/RepositoriesServiceProvider.php b/lib/Alchemy/Phrasea/Core/Provider/RepositoriesServiceProvider.php
index 5e50367f09..61d2fbbd83 100644
--- a/lib/Alchemy/Phrasea/Core/Provider/RepositoriesServiceProvider.php
+++ b/lib/Alchemy/Phrasea/Core/Provider/RepositoriesServiceProvider.php
@@ -175,7 +175,8 @@ class RepositoriesServiceProvider implements ServiceProviderInterface
             $repository = new DbalCollectionReferenceRepository($app->getApplicationBox()->get_connection());
 
             return new ArrayCacheCollectionReferenceRepository($repository);
-        });	
+        });
+
         $app['repo.collections-registry'] = $app->share(function (PhraseaApplication $app) {
             $factory = new CollectionFactory($app);
             $connectionProvider = new DataboxConnectionProvider($app->getApplicationBox());