Value lists are based on the index of the field and empties do not count.
Why not give the user a small "delete" button (an 'x' will do if you don't have much space) that will clear out the field?
Okey. a delete button would not be possible. Possible to do a clear in the selectlist?
Okey. a delete button would not be possible.
An alternate method would be to have an entry in your list that says "<empty>" and then use an auto-enter calc on the target field to set the field to "" when it detects "<empty>".
I tend to:
1) teach the users how to Delete the selection - select and while selected, click the Del key on the keyboard
2) provide a button with "Clear" text that performs:
Set Field ( myField ; "" // this will clear the field )