diff --git a/src/balderhub/data/lib/utils/single_data_item.py b/src/balderhub/data/lib/utils/single_data_item.py
index 694605e..68b4052 100644
--- a/src/balderhub/data/lib/utils/single_data_item.py
+++ b/src/balderhub/data/lib/utils/single_data_item.py
@@ -613,7 +613,12 @@ def needs_to_be_checked(self_val, other_val):
 
                         # a sub SingleDataItem was expected and make sure that it is one
                         if issubclass(inner_type, SingleDataItem) and isinstance(cur_self_item, SingleDataItem):
-                            error_list.extend(cur_self_item.get_difference_error_messages(cur_other_item))
+                            error_list.extend(cur_self_item.get_difference_error_messages(
+                                cur_other_item,
+                                allow_non_definable=allow_non_definable,
+                                validate_unique_identification_separately=validate_unique_identification_separately
+                                # TODO also support excluded fields here
+                            ))
                             continue
                         # normal item -> compare values
                         if cur_self_item != cur_other_item:
diff --git a/tests/scenarios/scenario_utils_single_data_item.py b/tests/scenarios/scenario_utils_single_data_item.py
index 138cfc0..cfc2f7f 100644
--- a/tests/scenarios/scenario_utils_single_data_item.py
+++ b/tests/scenarios/scenario_utils_single_data_item.py
@@ -222,6 +222,23 @@ def test_get_field_value_not_definable(self):
         item = SimpleDataItem.create_non_definable(nested=True)
         assert item.get_field_value("name") == NOT_DEFINABLE
 
+    def test_compare_list_with_non_definable_elems(self):
+        item = ListDataItem(items=[], nested_items=[
+            SimpleDataItem(name="test", value=42),
+            SimpleDataItem(name="test", value=99),
+        ])
+        item2 = ListDataItem(items=[], nested_items=[
+            SimpleDataItem(name="test", value=NOT_DEFINABLE),
+            SimpleDataItem(name="test", value=99),
+        ])
+
+        compare_error_msgs = item.get_difference_error_messages(
+            item2,
+            allow_non_definable=True,
+            validate_unique_identification_separately=False
+        )
+        assert compare_error_msgs == [], compare_error_msgs
+
     def test_get_field_value_missing_raises_key_error(self):
         item = SimpleDataItem.create_as_nested(name="test", value=42)
         try: