diff --git a/src/caosadvancedtools/models/data_model.py b/src/caosadvancedtools/models/data_model.py
index 266414893bcdf1ab45ee1345fc549e15f4a66250..bda8cad62a8a13c494ef79b36aaa72c49ff79e0c 100644
--- a/src/caosadvancedtools/models/data_model.py
+++ b/src/caosadvancedtools/models/data_model.py
@@ -145,8 +145,10 @@ class DataModel(dict):
                 else:
                     query = db.Query(f"FIND ENTITY with id={ent.id}")
                     ref = query.execute(unique=True)
-                diff = (describe_diff(*compare_entities(ent, ref
-                                                        ), name=ent.name))
+                diff = (describe_diff(*compare_entities(ent, ref),
+                                      name=ent.name,
+                                      label_old="version from the yaml file",
+                                      label_new="version from LinkAhead"))
 
                 if diff != "":
                     if verbose:
diff --git a/unittests/test_yaml_model_parser.py b/unittests/test_yaml_model_parser.py
index 371090cfc7571d9afa1f82f4f2e756bed618171c..bef2a1b56b4db60bbe9978f7ed0e03125a0a9f7a 100644
--- a/unittests/test_yaml_model_parser.py
+++ b/unittests/test_yaml_model_parser.py
@@ -21,7 +21,11 @@ from datetime import date
 from tempfile import NamedTemporaryFile
 from pytest import raises, mark
 
+from unittest.mock import Mock
+
 import linkahead as db
+
+import caosadvancedtools
 from caosadvancedtools.models.parser import (TwiceDefinedException,
                                              YamlDefinitionError,
                                              parse_model_from_string,
@@ -644,18 +648,58 @@ RT2:
 
 
 def test_setting_values():
-  model = parse_model_from_string("""
-parameter:
-  datatype: INTEGER
-
-Simulation:
-  role: Record
+    model = parse_model_from_string("""
+  parameter:
+    datatype: INTEGER
+
+  Simulation:
+    role: Record
+    obligatory_properties:
+      parameter: 26
+  """)
+
+    assert len(model) == 2
+    assert str(model["parameter"])[:-1] == '<Property name="parameter" datatype="INTEGER"/>'
+    assert model["Simulation"].role == "Record"
+    assert model["Simulation"].name == "Simulation"
+    assert model["Simulation"].get_property("parameter").value == 26
+
+
+def test_sync_output(capfd):
+    model = parse_model_from_string("""
+RT:
   obligatory_properties:
-    parameter: 26
+    identifier:
+      datatype: TEXT
 """)
 
-  assert len(model) == 2
-  assert str(model["parameter"])[:-1] == '<Property name="parameter" datatype="INTEGER"/>'
-  assert model["Simulation"].role == "Record"
-  assert model["Simulation"].name == "Simulation"
-  assert model["Simulation"].get_property("parameter").value == 26
+    existing_entities = [db.RecordType(name="RT", id=25).add_property(name="identifier",
+                                                                      datatype="INTEGER",
+                                                                      importance="OBLIGATORY",
+                                                                      id=24),
+                         db.Property(name="identifier", datatype="INTEGER", id=24)]
+
+    def get_existing_entities(ent_cont):
+        return existing_entities
+
+    class MockQuery:
+        def __init__(self, q):
+            self.q = q
+
+        def execute(self, unique=True):
+            id = int(self.q.split("=")[1])
+            for existing_ent in existing_entities:
+                if existing_ent.id == id:
+                    return existing_ent
+            return None
+
+    model.get_existing_entities = get_existing_entities
+    caosadvancedtools.models.parser.db.Query = MockQuery
+    caosadvancedtools.models.parser.db.Container.update = Mock()
+
+    model.sync_data_model(True, True)
+    assert caosadvancedtools.models.parser.db.Container.update.called
+    output, err = capfd.readouterr()
+    print(output)
+    assert "version from the yaml file: TEXT" in output
+    assert "version from LinkAhead: INTEGER" in output