[FIX] base_tier_validation_forward: Backward creation is done after v…

…alidate previous forward tier

base_tier_validation_forward/models/tier_validation.py

@@ -102,8 +102,8 @@ def _notify_forwarded_reviews_body(self):
 
     def _validate_tier(self, tiers=False):
         self.ensure_one()
-        self._create_backward(tiers)
         super()._validate_tier(tiers=tiers)
+        self._create_backward(tiers)
 
     def _create_backward(self, tiers):
         """ Find the forward tier that require to backward """