diff --git a/mysql/tables/llx_facture_tva_sum.sql b/mysql/tables/llx_facture_tva_sum.sql
index cadd701748b..aa8b5a13f88 100644
--- a/mysql/tables/llx_facture_tva_sum.sql
+++ b/mysql/tables/llx_facture_tva_sum.sql
@@ -21,10 +21,9 @@
 
 create table llx_facture_tva_sum
 (
-  rowid         integer AUTO_INCREMENT PRIMARY KEY,
   fk_facture    integer NOT NULL,
-  amount        real,
-  tva_tx        real default 19.6,
+  amount        real  NOT NULL,
+  tva_tx        real  NOT NULL,
 
   KEY(fk_facture)
 );