diff --git a/src/caosdb/high_level_api.py b/src/caosdb/high_level_api.py
index 427a095a4bafc0c372b0169298f2980dbd902c49..005a20bbba26fd5bee16eac612bd8ebe81f1294a 100644
--- a/src/caosdb/high_level_api.py
+++ b/src/caosdb/high_level_api.py
@@ -629,18 +629,20 @@ class CaosDBPythonEntity(object):
         else:
             entity = CaosDBPythonRecord()
 
-        for parent in serialization["parents"]:
-            if "unresolved" in parent:
-                id = None
-                name = None
-                if "id" in parent:
-                    id = parent["id"]
-                if "name" in parent:
-                    name = parent["name"]
-                entity.add_parent(CaosDBPythonUnresolvedParent(
-                    id=id, name=name))
-            else:
-                raise NotImplementedError()
+        if "parents" in serialization:
+            for parent in serialization["parents"]:
+                if "unresolved" in parent:
+                    id = None
+                    name = None
+                    if "id" in parent:
+                        id = parent["id"]
+                    if "name" in parent:
+                        name = parent["name"]
+                    entity.add_parent(CaosDBPythonUnresolvedParent(
+                        id=id, name=name))
+                else:
+                    raise NotImplementedError(
+                        "Currently, only unresolved parents can be deserialized.")
 
         for baseprop in ("name", "id", "description", "version"):
             if baseprop in serialization:
@@ -673,7 +675,8 @@ class CaosDBPythonEntity(object):
                     if f.name in metadata:
                         propmeta.__setattr__(f.name, metadata[f.name])
             else:
-                raise NotImplementedError()
+                pass
+                # raise NotImplementedError()
 
         return entity