Checks to ensure the 'Finish Date' field occurs after the 'Start Date' field.
Fragment validator
This validator requires these references to already exist:
‘start_date’ – A field path reference to the Start date field, which must be present in the form
‘finish_date’ – A field path reference to the Finish date field, which must be present in the form
The validator can then be applied to either the start or end date field on the form, depending where you want the error message to appear.