diff --git a/tryton/modules/account_dunning/dunning.py b/tryton/modules/account_dunning/dunning.py
index fa7aadd494..deb4dd69b5 100644
--- a/tryton/modules/account_dunning/dunning.py
+++ b/tryton/modules/account_dunning/dunning.py
@@ -63,6 +63,17 @@ class Level(sequence_ordered(), ModelSQL, ModelView):
         return '%s@%s' % (self.procedure.levels.index(self),
             self.procedure.rec_name)

+    @classmethod
+    def search_rec_name(cls, name, clause):
+        _, operator, value = clause
+        if operator.startswith('!') or operator.startswith('not '):
+            bool_op = 'AND'
+        else:
+            bool_op = 'OR'
+        return [bool_op,
+            ('procedure.rec_name', *clause[1:]),
+            ]
+
     def test(self, line, date):
         if self.overdue is not None:
             return (date - line.maturity_date) >= self.overdue