diff --git a/unittests/test_apiutils.py b/unittests/test_apiutils.py
index 3877c09ef0e30ecf81cd4c86e4b611a6256ca139..33159c97b05bb54845f341f9df14d2bf712747c9 100644
--- a/unittests/test_apiutils.py
+++ b/unittests/test_apiutils.py
@@ -111,13 +111,25 @@ def test_compare_entities():
     r2.add_property("tester", )
     r1.add_property("tests_234234", value=45)
     r2.add_property("tests_TT", value=45)
+    r1.add_property("datatype", value=45, datatype=db.INTEGER)
+    r2.add_property("datatype", value=45)
+    r1.add_property("entity_id", value=2)
+    r2.add_property("entity_id", value=24)
+    r1.add_property("entity_mix_e", value=2)
+    r2.add_property("entity_mix_e", value=db.Entity(id=2))
+    r1.add_property("entity_mix_d", value=22)
+    r2.add_property("entity_mix_d", value=db.Entity(id=2))
+    r1.add_property("entity_Ent_e", value=db.Entity(id=2))
+    r2.add_property("entity_Ent_e", value=db.Entity(id=2))
+    r1.add_property("entity_Ent_d", value=db.Entity(id=2))
+    r2.add_property("entity_Ent_d", value=db.Entity(id=22))
 
     diff_r1, diff_r2 = compare_entities(r1, r2)
 
     assert len(diff_r1["parents"]) == 1
     assert len(diff_r2["parents"]) == 0
-    assert len(diff_r1["properties"]) == 4
-    assert len(diff_r2["properties"]) == 4
+    assert len(diff_r1["properties"]) == 10
+    assert len(diff_r2["properties"]) == 10
 
     assert "test" not in diff_r1["properties"]
     assert "test" not in diff_r2["properties"]
@@ -135,6 +147,19 @@ def test_compare_entities():
     assert "tests_TT" in diff_r2["properties"]
 
 
+    assert "entity_id" in diff_r1["properties"]
+    assert "entity_id" in diff_r2["properties"]
+
+    assert "entity_mix_e" in diff_r1["properties"]
+    assert "entity_mix_e" in diff_r2["properties"]
+    assert "entity_Ent_e" in diff_r1["properties"]
+    assert "entity_Ent_e" in diff_r2["properties"]
+
+    assert "entity_mix_d" in diff_r1["properties"]
+    assert "entity_mix_d" in diff_r2["properties"]
+    assert "entity_Ent_d" in diff_r1["properties"]
+    assert "entity_Ent_d" in diff_r2["properties"]
+
 def test_compare_entities_units():
     r1 = db.Record()
     r2 = db.Record()
@@ -572,12 +597,19 @@ B: something else"""
 
     # test whether an id is correctly overwritten by an entity without id
     recA = db.Record().add_parent("A").add_property(name="B", value=112)
-    newRec = db.Record()
+    newRec = db.Record().add_parent("B").add_property("c")
     recB = db.Record().add_parent("A").add_property(name="B", value=newRec)
 
     merge_entities(recA, recB, force=True)
     assert recA.get_property("B").value == newRec
 
+    recA = db.Record().add_parent("A").add_property(name="B", value=[112],
+                                                    datatype=db.LIST("B"))
+    recB = db.Record().add_parent("A").add_property(name="B", value=[newRec], datatype=db.LIST(db.REFERENCE))
+
+    merge_entities(recA, recB, force=True)
+    assert recA.get_property("B").value == [newRec]
+
 
 def test_merge_missing_list_datatype_82():
     """Merging two properties, where the list-valued one has no datatype."""