diff --git a/application/Espo/ORM/DB/Mapper.php b/application/Espo/ORM/DB/Mapper.php
index e75d35d34a..d2ca105df5 100644
--- a/application/Espo/ORM/DB/Mapper.php
+++ b/application/Espo/ORM/DB/Mapper.php
@@ -127,6 +127,13 @@ interface Mapper
      */
     public function insert(Entity $entity);
 
+    /**
+     * Insert an entity collaction.
+     *
+     * @return TRUE if success.
+     */
+    public function massInsert(Collection $collection) : bool;
+
     /**
      * Update an entity in DB.
      *
@@ -134,7 +141,6 @@ interface Mapper
      */
     public function update(Entity $entity) : ?string;
 
-
     /**
      * Delete an entity (mark as deleted).
      *