I have a problem restoring the default value of a field. The type of the field is List box, displayed as RadioButtonList, with a default value of None selected.
When a product has a value selected, it is not possible to restore the default unselected value. In the PIM module, it looks like you can edit the field to restore the unselected value, but after saving the previuous value is still there.
How can I restore the default unselected value?