Update doc/tutorials/hltefficiencychecker.rst

doc/tutorials/hltefficiencychecker.rst

@@ -44,7 +44,13 @@ which has its name because it is dependent on ``Moore`` and requires *tuple tool
 and these tools historically lived in the ``Analysis`` project (before being moved to ``MooreAnalysis``).
 
 First of all, you'll need a working build of the LHCb software stack that you can develop. If you don't have
-this yet, follow the instructions on the :doc:`developing` page. Once you have the stack, you need to get ``MooreAnalysis`` as well.
+this yet, follow the instructions on the :doc:`developing` page. 
+
+.. note::
+
+    If you are planning to test your lines with simulation samples produced before 2023, beware that the DD4Hep condition database may not be suited for the task. In this case, remember to build for one of the `detdesc` platforms that successfully run in the `nightlies<https://lhcb-nightlies.web.cern.ch/nightly/lhcb-master/>`_
+
+Once you have the stack, you need to get ``MooreAnalysis`` as well.
 From your top-level ``stack/`` directory do::
 
     make MooreAnalysis