add display names non-unique warning

examples/notebooks/introduction_enlyze_python_sdk.ipynb

@@ -1325,7 +1325,13 @@
    "source": [
     "The `get_timeseries` expects a start and end time, ideally with a timezone specified, and a list of variables.\n",
     "\n",
-    "It then returns a `TimeseriesData` object, from which the data can be retrieved as a pandas DataFrame or dictionary (records). By default, the column names will be set to the `variable_uuids` but if `use_display_names` is set to True, it will return the DataFrame with human-readable names."
+    "It then returns a `TimeseriesData` object, from which the data can be retrieved as a pandas DataFrame or dictionary (records). By default, the column names will be set to the `variable_uuids` but if `use_display_names` is set to True, it will return the DataFrame with human-readable names.\n",
+    "\n",
+    "<div class=\"alert alert-block alert-info\">\n",
+    "<b>Note:</b> Display names are not guaranteed to be unique for an appliance.\n",
+    "</div>\n",
+    "\n",
+    "If two or more variables with the same display name exist, there will be multiple columns with the same name. This can lead to unexpected behavior in later steps. However, display names can be adjusted in the app at any time, thus solving this problem.\n"
    ]
   },
   {