diff --git a/src/caosdb/high_level_api.py b/src/caosdb/high_level_api.py
index 8bcbbcdc59e8c83f2f9d10ddea94b71addb2f832..d4d89654a41ba03eb2fd3c141541e42e4a5f5bf8 100644
--- a/src/caosdb/high_level_api.py
+++ b/src/caosdb/high_level_api.py
@@ -700,76 +700,6 @@ def _single_convert_to_entity(entity: db.Entity,
 
     return entity
 
-    def add_property(entity, prop, name, _recursive=False, datatype=None):
-        if datatype is None:
-            raise RuntimeError("Datatype must not be None.")
-
-        if isinstance(prop, CaosDBPythonEntity):
-            entity.add_property(name=name, value=str(
-                prop._id), datatype=datatype)
-
-            if _recursive and not prop.do_not_expand:
-                return convert_to_entity(prop, recursive=_recursive)
-            else:
-                return []
-        else:
-            if isinstance(prop, float) or isinstance(prop, int):
-                prop = str(prop)
-            entity.add_property(name=name, value=prop, datatype=datatype)
-
-            return []
-
-    if recursive_depth == 0:
-        recursive = False
-    else:
-        recursive = True
-
-    for prop in robj.get_properties():
-        value = robj.__getattribute__(prop)
-        metadata = robj.get_property_metadata(prop)
-
-        if isinstance(value, CaosDBPythonUnresolvedReference):
-            pass
-        elif isinstance(value, CaosDBMultiProperty):
-            raise NotImplementedError()
-        elif isinstance(value, list):
-            if robj._datatypes[prop][0:4] == "LIST":
-                lst = []
-
-                for v in value:
-                    if isinstance(v, CaosDBPythonEntity):
-                        lst.append(v._id)
-
-                        if recursive and not v.do_not_expand:
-                            children.append(convert_to_entity(
-                                v, recursive=recursive_depth-1))
-                    else:
-                        if isinstance(v, float) or isinstance(v, int):
-                            lst.append(str(v))
-                        else:
-                            lst.append(v)
-                entity.add_property(name=prop, value=lst,
-                                    datatype=robj._datatypes[prop])
-            else:
-                for v in value:
-                    children.extend(
-                        add_property(
-                            entity,
-                            v,
-                            prop,
-                            datatype=robj._datatypes[prop],
-                            **kwargs))
-        else:
-            children.extend(
-                add_property(
-                    entity,
-                    value,
-                    prop,
-                    datatype=robj._datatypes[prop],
-                    **kwargs))
-
-    return [entity] + children
-
 
 def convert_to_entity(python_object):
     if isinstance(python_object, db.Container):