I have used "SelectList" cusotm field type in transition screen.
It contains "None" as first option in select list field.
I have marked "Required" in field configuration. Though, it allows to select "None" while submit the transition. i want it to be mandatory validation to select other then "None" in transition screen.
Alternatively, you can remove the 'None' from the Select list options by referring to the following links:
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