Try to create a custom field (i.e. in contacts) that has the same name of a custom field created for another extension (i.e. contents).
The ideal would be to let creating custom fields with the same name, if they are associated to different extensions, but, if not possible, a message should explain better why that field already exists.
appears this message:
"Save failed with the following error: Another Field has the same name (remember it may be a trashed item)."
|Closed_Date||0000-00-00 00:00:00||⇒||2017-05-17 11:00:32|