diff --git a/models/scop_bordereau_cg.py b/models/scop_bordereau_cg.py
index 13dd6e23b89bdb4ed01aebfe82b6602b32b3133b..3654590797a9ccd7dc09ef8c533266f5f08284af 100644
--- a/models/scop_bordereau_cg.py
+++ b/models/scop_bordereau_cg.py
@@ -38,7 +38,10 @@ class Bordereau(models.Model):
         track_visibility='onchange')
     member_number = fields.Integer(
         string='N° Adhérent',
-        related='partner_id.member_number_int')
+        related='partner_id.member_number_int',
+        store=True,
+        index=True
+    )
     liasse_fiscale_id = fields.Many2one(
         comodel_name='scop.liasse.fiscale',
         string='Liasse fiscale de référence',