[UPD]Change many2many to one2many

models/enercoop_counter.py

@@ -16,10 +16,11 @@ class EnercoopCounter(models.Model):
     # enercoop_operation_id = fields.Many2one(
     #     comodel_name='enercoop.operation',
     #     string="Nom de l'opération")
-    enercoop_operation_ids = fields.Many2many(
-        comodel_name='enercoop.operation',
-        relation='counter_operation_rel',
-        string="Opérations liées")
+    enercoop_operation_ids = fields.One2many(
+        comodel_name='enercoop.counter.operation',
+        inverse_name='enercoop_counter_id',
+        string="Opérations liées",
+        auto_join=True)
     street = fields.Char("Rue")
     street2 = fields.Char("Complément de rue")
     zip = fields.Char("Code postal")