diff --git a/htdocs/install/mysql/migration/22.0.0-23.0.0.sql b/htdocs/install/mysql/migration/22.0.0-23.0.0.sql
index f8a2cce8326..3ebdeecf0d1 100644
--- a/htdocs/install/mysql/migration/22.0.0-23.0.0.sql
+++ b/htdocs/install/mysql/migration/22.0.0-23.0.0.sql
@@ -394,4 +394,6 @@ CREATE TABLE llx_expensereport_det_extrafields
 ALTER TABLE llx_blockedlog ADD INDEX idx_ref_object (ref_object);
 ALTER TABLE llx_blockedlog ADD CONSTRAINT fk_linktoref FOREIGN KEY (linktoref) REFERENCES llx_blockedlog(ref_object);
 
+ALTER TABLE llx_fichinterdet ADD COLUMN special_code integer DEFAULT 0 AFTER fk_parent_line
+
 -- end of migration
diff --git a/htdocs/install/mysql/tables/llx_fichinterdet.sql b/htdocs/install/mysql/tables/llx_fichinterdet.sql
index f25c14f14d8..043c55d6cc3 100644
--- a/htdocs/install/mysql/tables/llx_fichinterdet.sql
+++ b/htdocs/install/mysql/tables/llx_fichinterdet.sql
@@ -22,6 +22,7 @@ create table llx_fichinterdet
   rowid             integer AUTO_INCREMENT PRIMARY KEY,
   fk_fichinter      integer,
   fk_parent_line    integer NULL,
+  special_code      integer DEFAULT 0, -- code for special lines (may be 1=transport, 2=ecotax, 3=option, moduleid=...)
   date              datetime,          -- date de la ligne d'intervention
   description       text,              -- description de la ligne d'intervention
   duree             integer,           -- duree de la ligne d'intervention