diff --git a/trytond/model/modelstorage.py b/trytond/model/modelstorage.py
index 1c5a4c3b7e..3a0000e0b8 100644
--- a/trytond/model/modelstorage.py
+++ b/trytond/model/modelstorage.py
@@ -81,6 +81,14 @@ def without_check_access(func):
     return wrapper
 
 
+def without_rule(func):
+    @wraps(func)
+    def wrapper(*args, **kwargs):
+        with Transaction().set_user(0):
+            return func(*args, **kwargs)
+    return wrapper
+
+
 def cache_size():
     return Transaction().context.get('_record_cache_size', _cache_record)
 
@@ -1038,6 +1046,7 @@ class ModelStorage(Model):
 
     @classmethod
     @without_check_access
+    @without_rule
     def _validate(cls, records, field_names=None):
         pool = Pool()
         # Ensure that records are readable