In the following use case the transition can only be executed, if the defined due date is in the future.
Add the condition or validator to the desired transition or create a new transition.
Choose Due date
Choose >
Select field Current date and time
Please define a due date which lies in the future!
Compare two values condition
Compare two values validator
The due date must be in the future.
This use case is valid for both conditions and validators . The only difference is that you can specify an additional error message when using a validator.