diff --git a/datamodel/app/vw_validation.sql b/datamodel/app/vw_validation.sql
index dfdd3eda..889ee4e0 100644
--- a/datamodel/app/vw_validation.sql
+++ b/datamodel/app/vw_validation.sql
@@ -6,9 +6,9 @@ CREATE OR REPLACE VIEW signalo_app.vw_validation AS
         greatest(su._last_modification_date, a._last_modification_date, f._last_modification_date, si._last_modification_date) AS last_modification_date,
         su.needs_validation or a.needs_validation or f.needs_validation or si.needs_validation AS needs_validation
     FROM signalo_db.support su
-    LEFT JOIN (SELECT id, fk_support, needs_validation, MAX(_last_modification_date) OVER (PARTITION BY fk_support) AS _last_modification_date FROM signalo_db.azimut ) a ON a.fk_support = su.id
-    LEFT JOIN (SELECT id, fk_azimut, needs_validation, MAX(_last_modification_date) OVER (PARTITION BY fk_azimut) AS _last_modification_date FROM signalo_db.frame) f ON f.fk_azimut = a.id
-    LEFT JOIN (SELECT id, fk_frame, needs_validation, MAX(_last_modification_date) OVER (PARTITION BY fk_frame) AS _last_modification_date FROM signalo_db.sign) si ON si.fk_frame = f.id;
+    LEFT JOIN (SELECT id, fk_support, needs_validation, MAX(_last_modification_date) OVER (PARTITION BY fk_support ORDER BY needs_validation DESC NULLS LAST) AS _last_modification_date FROM signalo_db.azimut ) a ON a.fk_support = su.id
+    LEFT JOIN (SELECT id, fk_azimut, needs_validation, MAX(_last_modification_date) OVER (PARTITION BY fk_azimut ORDER BY needs_validation DESC NULLS LAST) AS _last_modification_date FROM signalo_db.frame) f ON f.fk_azimut = a.id
+    LEFT JOIN (SELECT id, fk_frame, needs_validation, MAX(_last_modification_date) OVER (PARTITION BY fk_frame ORDER BY needs_validation DESC NULLS LAST) AS _last_modification_date FROM signalo_db.sign) si ON si.fk_frame = f.id;
 
 CREATE FUNCTION signalo_app.ft_validation_update() RETURNS trigger
     LANGUAGE plpgsql
diff --git a/datamodel/changelogs/0102/0101_02_control.sql b/datamodel/changelogs/0102/0101_02_control.sql
index e0823521..4dbe521d 100644
--- a/datamodel/changelogs/0102/0101_02_control.sql
+++ b/datamodel/changelogs/0102/0101_02_control.sql
@@ -3,10 +3,10 @@ ALTER TABLE signalo_db.azimut DROP COLUMN _edited;
 ALTER TABLE signalo_db.frame DROP COLUMN _edited;
 ALTER TABLE signalo_db.sign DROP COLUMN _edited;
 
-ALTER TABLE signalo_db.support ADD COLUMN needs_validation boolean default false;
-ALTER TABLE signalo_db.azimut ADD COLUMN needs_validation boolean default false;
-ALTER TABLE signalo_db.frame ADD COLUMN needs_validation boolean default false;
-ALTER TABLE signalo_db.sign ADD COLUMN needs_validation boolean default false;
+ALTER TABLE signalo_db.support ADD COLUMN needs_validation boolean not null default false;
+ALTER TABLE signalo_db.azimut ADD COLUMN needs_validation boolean not null default false;
+ALTER TABLE signalo_db.frame ADD COLUMN needs_validation boolean not null default false;
+ALTER TABLE signalo_db.sign ADD COLUMN needs_validation boolean not null default false;
 
 ALTER TABLE signalo_db.support ADD COLUMN _last_modification_platform text default null;
 ALTER TABLE signalo_db.azimut ADD COLUMN _last_modification_platform text default null;