diff --git a/htdocs/install/mysql/migration/3.8.0-3.9.0.sql b/htdocs/install/mysql/migration/3.8.0-3.9.0.sql
index 0705512893e..a846eeff889 100755
--- a/htdocs/install/mysql/migration/3.8.0-3.9.0.sql
+++ b/htdocs/install/mysql/migration/3.8.0-3.9.0.sql
@@ -235,13 +235,12 @@ create table llx_budget_lines
   import_key    integer  
 )ENGINE=innodb;
 
-ALTER TABLE llx_budget_lines ADD UNIQUE INDEX uk_budget_lines (fk_budget, fk_project);
+ALTER TABLE llx_budget_lines ADD UNIQUE INDEX uk_budget_lines (fk_budget, fk_project_ids);
 
 -- Supprime orphelins pour permettre montee de la cle
 -- MYSQL V4 DELETE llx_budget_lines FROM llx_budget_lines LEFT JOIN llx_budget ON llx_budget.rowid = llx_budget_lines.fk_budget WHERE llx_budget_lines.rowid IS NULL;
 -- POSTGRESQL V8 DELETE FROM llx_budget_lines USING llx_budget WHERE llx_budget_lines.fk_budget NOT IN (SELECT llx_budget.rowid FROM llx_budget);
 
-ALTER TABLE llx_budget_lines ADD INDEX idx_budget_lines (fk_project);
 ALTER TABLE llx_budget_lines ADD CONSTRAINT fk_budget_lines_budget FOREIGN KEY (fk_budget) REFERENCES llx_budget (rowid);
 
 
diff --git a/htdocs/install/mysql/tables/llx_budget_lines.key.sql b/htdocs/install/mysql/tables/llx_budget_lines.key.sql
index 9a9771570b1..b31e74b324d 100644
--- a/htdocs/install/mysql/tables/llx_budget_lines.key.sql
+++ b/htdocs/install/mysql/tables/llx_budget_lines.key.sql
@@ -17,11 +17,10 @@
 -- ===================================================================
 
 
-ALTER TABLE llx_budget_lines ADD UNIQUE INDEX uk_budget_lines (fk_budget, fk_project);
+ALTER TABLE llx_budget_lines ADD UNIQUE INDEX uk_budget_lines (fk_budget, fk_project_ids);
 
 -- Supprime orphelins pour permettre montee de la cle
 -- MYSQL V4 DELETE llx_budget_lines FROM llx_budget_lines LEFT JOIN llx_budget ON llx_budget.rowid = llx_budget_lines.fk_budget WHERE llx_budget_lines.rowid IS NULL;
 -- POSTGRESQL V8 DELETE FROM llx_budget_lines USING llx_budget WHERE llx_budget_lines.fk_budget NOT IN (SELECT llx_budget.rowid FROM llx_budget);
 
-ALTER TABLE llx_budget_lines ADD INDEX idx_budget_lines (fk_project);
 ALTER TABLE llx_budget_lines ADD CONSTRAINT fk_budget_lines_budget FOREIGN KEY (fk_budget) REFERENCES llx_budget (rowid);