In the Feature Analyzer of MAE 16.5 all date charts can only be used if there aren't any values of NULL.
If there are values of NULL, the format is taken as incorrect and the chart can't be defined.
However, we have got a lot of examples where it would be reasonable to show date charts containing NA's.
One example might be the analysis of objects that must be maintained. In this case, there is the need of a capture date (no NULL values), a chart of the status (open/closed) and another date chart that shows the date where the maintenance was done (NULL values).
I suggest a similar checkbox as for other charts saying 'Hide Null or Empty Values'. FA_NULLValues.png