diff --git a/htdocs/install/mysql/migration/3.3.0-3.4.0.sql b/htdocs/install/mysql/migration/3.3.0-3.4.0.sql
index 46affb6327a..155e27508fa 100755
--- a/htdocs/install/mysql/migration/3.3.0-3.4.0.sql
+++ b/htdocs/install/mysql/migration/3.3.0-3.4.0.sql
@@ -376,3 +376,5 @@ create table llx_facture_fourn_extrafields
 ALTER TABLE llx_facture_fourn_extrafields ADD INDEX idx_facture_fourn_extrafields (fk_object);
 
 ALTER TABLE llx_user_clicktodial ADD COLUMN url varchar(255) AFTER fk_user;
+
+ALTER TABLE llx_fichinterdet ADD COLUMN fk_parent_line integer NULL AFTER fk_fichinter;
diff --git a/htdocs/install/mysql/tables/llx_fichinterdet.sql b/htdocs/install/mysql/tables/llx_fichinterdet.sql
index ada5557f1de..5fcd1b1d524 100644
--- a/htdocs/install/mysql/tables/llx_fichinterdet.sql
+++ b/htdocs/install/mysql/tables/llx_fichinterdet.sql
@@ -21,6 +21,7 @@ create table llx_fichinterdet
 (
   rowid             integer AUTO_INCREMENT PRIMARY KEY,
   fk_fichinter      integer,
+  fk_parent_line    integer NULL,
   date              datetime,          -- date de la ligne d'intervention
   description       text,              -- description de la ligne d'intervention
   duree             integer,           -- duree de la ligne d'intervention