For those of you who - like me - did not see the error, the comment should have been placed at the end, behind the terminating "/>".
The result was that when generating a Narrative Report, the configuration dialog did not pop up, but the generation process continued without stopping and logged the several steps in the log file.  No errors were signalled.  

Not sure if this can be detected during a generation run or not.  Maybe when merging the ConfigMsgLocal.xml files?