diff --git a/mysql/tables/llx_paiement_facture.sql b/mysql/tables/llx_paiement_facture.sql
index e69b200adf5..bb34dbd33a8 100644
--- a/mysql/tables/llx_paiement_facture.sql
+++ b/mysql/tables/llx_paiement_facture.sql
@@ -22,8 +22,8 @@
 create table llx_paiement_facture
 (
   rowid           integer AUTO_INCREMENT PRIMARY KEY,
-  fk_facture      integer,
   fk_paiement     integer,
+  fk_facture      integer,
   
-  unique key (fk_facture,fk_paiement)
+  unique key (fk_paiement,fk_facture)
 );