Missing Date fields in table maintenance generation

I have some non-key date fields in my custom table and have noticed that they do not get generated on the overview screen of my two-step table maintenance dialog. They are present on the detail screen.

If I change the domain of the fields to CHAR they appear.

If I change the maintenance type to one-step they appear.

It seems it is standard behaviour for date fields to be omitted from the overview screen.

Can anyone confirm that this is standard behaviour or give an explanation for date fields being treated in this manner?...or come up with a way of including the fields on the header screen.

I already know that I can:

1. customize the screen to include the fields

2. create a non-date domain for the fields which uses date-type calendar dropdown

Thanks,

Neil