diff --git a/l10n_ch_base_bank/models/bank.py b/l10n_ch_base_bank/models/bank.py
index 27a9ec646..147902f07 100644
--- a/l10n_ch_base_bank/models/bank.py
+++ b/l10n_ch_base_bank/models/bank.py
@@ -349,5 +349,5 @@ def onchange_partner_set_acc_number(self):
             if 'Bank/CCP' in self.acc_number:
                 self.acc_number = self._get_acc_name()
 
-    _sql_constraints = [('bvr_adherent_uniq', 'unique (bvr_adherent_num)',
-                         'The BVR adherent number must be unique !')]
+    _sql_constraints = [('bvr_adherent_uniq', 'unique (bvr_adherent_num, ccp)',
+                         'The BVR adherent number/ccp pair must be unique !')]