Change field options after form has been filled with data When creating my form, I wasn't enough aware of the configuration for the default core description field. I don't want a summary field, but I did not pay much attention at that  when setting my form in the past. Now, when I try to change the field options to remove the summary field, I get the message "There is data for this field in the database. The field settings can no longer be changed.". Is it possible to override this restriction and force the change?
I'm guessing the type is Long Text with Summary. If thats the case, can't you just go to admin/structure/types/manage/[your content type]/fields/[your field name] and uncheck Summary input.

Drupal will then automatically create a summary if it's required to, just as it would if you had chosen Long Text (without summary).