Refs #11998 - minor doc add

Documentation/Report.rst

@@ -2015,6 +2015,11 @@ Explanation:
 * Level 10.30 prints the return values ``firstName`` and ``myLink`` (as rendered link and as source definition). The last
   column is the output of the function - the value of ``NOW()``
 
+.. tip::
+
+If there are STORE_RECORD variables which can't be replaced: typically they have been not defined as function parameter
+or return values.
+
 .. _download:
 
 Download