diff --git a/mysql/migration/2.4.0-2.5.0.sql b/mysql/migration/2.4.0-2.5.0.sql
index 9fff10adca4..bb4106fdfa9 100644
--- a/mysql/migration/2.4.0-2.5.0.sql
+++ b/mysql/migration/2.4.0-2.5.0.sql
@@ -47,3 +47,5 @@ alter table llx_commandedet add column import_key         varchar(14);
 alter table llx_facture_fourn     add column import_key         varchar(14);
 alter table llx_facture_fourn_det add column import_key         varchar(14);
 
+alter table llx_commande    modify column source smallint NULL;
+
diff --git a/mysql/tables/llx_commande.sql b/mysql/tables/llx_commande.sql
index d0bcaf3ee9f..2071abc4340 100644
--- a/mysql/tables/llx_commande.sql
+++ b/mysql/tables/llx_commande.sql
@@ -34,7 +34,7 @@ create table llx_commande
   fk_user_author        integer,                       -- createur de la commande
   fk_user_valid         integer,                       -- valideur de la commande
   fk_user_cloture       integer,                       -- auteur cloture
-  source                smallint NOT NULL,
+  source                smallint,
   fk_statut             smallint  default 0,
   amount_ht             real      default 0,
   remise_percent        real      default 0,