[FIX] base_tier_validation : singleton error

base_tier_validation/models/tier_validation.py

@@ -88,7 +88,7 @@ class TierValidation(models.AbstractModel):
         for rec in self:
             tiers = self.env[
                 'tier.definition'].search([('model', '=', self._name)])
-            valid_tiers = any([self.evaluate_tier(tier) for tier in tiers])
+            valid_tiers = any([rec.evaluate_tier(tier) for tier in tiers])
             rec.need_validation = not rec.review_ids and valid_tiers and \
                 getattr(rec, self._state_field) in self._state_from