I have a submitted task using formService.submitTaskFormData(…), and this task will be converted (or transfered) to HistoricTaskInstance. Now I want to edit the form properties in this task, I can't (or do not want) to resubmit the form using formService.submitTaskFormData(…) again, so please help me to solve this problem.
When you have completed a task you can't change the form properties values anymore. But what you could do is map the task properties to process variables, and you can of course change a process variable value.