how can I have a required field but without a default value

Specifically I'm trying to have the Type custom field be a required field but I don't want it to have a default value.
So on screen 5 (select default values) of the Edit Custom Field wizard, I want  Can be empty to be unchecked.
But I don't want to set a default value.
I want to user to have to choose a value before saving but I don't want to default to a value (which may be the wrong one).
Is this possible?
Comment actions Permalink
Why can't you choose default value? Do you get an error?
Comment actions Permalink
on screen 5 of the wizard I choose:
Can be empty : unchecked
Empty field text : No Type
Default Value : no default value
when I click save it says : Please select default values.

So to recap, when a new issue is created I don't want to automatically choose a default Type. I want the user to be forced to choose one before they save. Is that possible?
Comment actions Permalink
Well, if you need to make the field 'Type' required, you have to choose 'Can be empty', input some 'empty text' and attach workflow that will prevent submitting issue with no 'Type':
rule require type 
when becomesReported() { 
  Type.required("Type is required!"); 

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