Skip test.

Author: WaVEV

django_mongodb/features.py

@@ -331,6 +331,7 @@ def django_test_expected_failures(self):
             "ordering.tests.OrderingTests.test_order_by_ptr_field_with_default_ordering_by_expression",
             "ordering.tests.OrderingTests.test_order_by_self_referential_fk",
             "ordering.tests.OrderingTests.test_orders_nulls_first_on_filtered_subquery",
+            "ordering.tests.OrderingTests.test_related_ordering_duplicate_table_reference",
             "ordering.tests.OrderingTests.test_reverse_meta_ordering_pure",
             "ordering.tests.OrderingTests.test_reversed_ordering",
             "timezones.tests.LegacyDatabaseTests.test_query_annotation",