diff --git a/src/caosdb/apiutils.py b/src/caosdb/apiutils.py
index a8256976b79d71f514fcc1dc9c868f1eeebc76e9..dc9209b58c8163da552f29e7a4435a0c640b1ecf 100644
--- a/src/caosdb/apiutils.py
+++ b/src/caosdb/apiutils.py
@@ -141,6 +141,9 @@ class CaosDBPythonEntity(object):
     _last_id = 0
 
     def __init__(self):
+        warnings.warn("The CaosDBPythonEntity class is deprecated, replacements will be provided by"
+                      " the high_level_api module.",
+                      DeprecationWarning, stacklevel=2)
         # Save a copy of the dry state
         # of this object in order to be
         # able to detect conflicts.
@@ -469,6 +472,9 @@ def _single_convert_to_entity(entity, robj, **kwargs):
 
 
 def convert_to_entity(python_object, **kwargs):
+    warnings.warn("The convert_to_entity function is deprecated, replacement will be provided by "
+                  "the high_level_api module.", DeprecationWarning, stacklevel=2)
+
     if isinstance(python_object, Container):
         # Create a list of objects:
 
@@ -490,6 +496,8 @@ def convert_to_entity(python_object, **kwargs):
 def convert_to_python_object(entity):
     """"""
 
+    warnings.warn("The convert_to_python_object function is deprecated, replacement will be "
+                  "provided by the high_level_api module.", DeprecationWarning, stacklevel=2)
     if isinstance(entity, Container):
         # Create a list of objects: