Hello,
I have a subtask of task and while first time importing i am sucessed to import the subtask but jira not take due date. after that i checked and change the date format and now i am using the subtask issue key,summary.issue type, due date,parent for updating the due date. but it ishowing the below error.
I do not want to create new subtask. i just want to add due date in existing subtask. I am sharing few screen shot and file which i used.


