diff --git a/htdocs/install/mysql/migration/7.0.0-8.0.0.sql b/htdocs/install/mysql/migration/7.0.0-8.0.0.sql
index 73e1ec4cab9..76695e9edfe 100644
--- a/htdocs/install/mysql/migration/7.0.0-8.0.0.sql
+++ b/htdocs/install/mysql/migration/7.0.0-8.0.0.sql
@@ -70,3 +70,7 @@ ALTER TABLE llx_expensereport_det ADD COLUMN docnumber varchar(128) after fk_exp
 
 ALTER TABLE llx_website_page ADD COLUMN aliasalt varchar(255) after pageurl;
 
+-- Add missing primary key
+ALTER TABLE llx_c_paiement CHANGE COLUMN id id INTEGER AUTO_INCREMENT PRIMARY KEY;
+
+
diff --git a/htdocs/install/mysql/tables/llx_c_paiement.key.sql b/htdocs/install/mysql/tables/llx_c_paiement.key.sql
index ad1930fba2e..1e22789d7bf 100644
--- a/htdocs/install/mysql/tables/llx_c_paiement.key.sql
+++ b/htdocs/install/mysql/tables/llx_c_paiement.key.sql
@@ -18,3 +18,5 @@
 -- ========================================================================
 
 ALTER TABLE llx_c_paiement ADD UNIQUE INDEX uk_c_paiement(id, entity, code);
+
+ALTER TABLE llx_c_paiement ADD UNIQUE INDEX uk_c_paiement_code(entity, code);
diff --git a/htdocs/install/mysql/tables/llx_c_paiement.sql b/htdocs/install/mysql/tables/llx_c_paiement.sql
index 55cb44fb257..1c26cb7aaeb 100644
--- a/htdocs/install/mysql/tables/llx_c_paiement.sql
+++ b/htdocs/install/mysql/tables/llx_c_paiement.sql
@@ -21,7 +21,7 @@
 
 create table llx_c_paiement
 (
-  id					integer,
+  id					integer AUTO_INCREMENT PRIMARY KEY,
   entity				integer	DEFAULT 1 NOT NULL,	-- multi company id
   code       		varchar(6)  NOT NULL,
   libelle    		varchar(62),