I've got a Picture Library which contains entries and has a default Date column based on the Date and Time type. For some reason, this Date column lacks the option to set it to be Required:
If I create a new custom column and give it the Date and Time type, however, I can set it to Required, amongst other things:
...but I don't want two Date fields duplicating the same data, I just want to set the default Date field to Required. It looks like this should be possible, since there's a space for it in the list, but I can't find any way to put a tick in that column:
All my custom columns can be set to Required, including ones which have some existing entries where that column is blank. For the default fields, however, that option is hidden, with no explanation as to why.
How can I set the default Date field to Required?