Copy parent field value to subtasks

[Javen Li]

Here is my original requirement:

I want to define due date to each story during the Sprint planning. After that, I would like to sync field value of the story to the "due date" field of all its subtasks.

So that during the daily meeting, we can see the gap between planned due date. (We are using Active Sprint for daily meeting and swiming lane is based on person)

The way I tried to achieve this is:

1. Add due date to both Story and its subtasks

2. Add a transition for Story, the transition will not change status but just trigger a post function to copy the value.

3. Add a "Update Any Issue Field" post function and copy parent field to subtasks.

Now I face an issue for Step 3. Here is my setting for the post function:

Update field on all issues related as	Parent/Sub-Tasks (All Sub-Tasks)
Perform  As User	leave blank
Issue Field	Due Date
Field Value	{{issue.parent.fields.duedate}}

Saved and have a try, then I got a jira ticket update error.

Then I changed the updated field to "Description" just for debug, save and have a try again. I found that the text value "issue.parent.fields.description" is appended to subtasks description. This must be the reason for update failed on due date as it tries to set "issue.parent.fields.duedate" to a date format field that will lead format mismatch.

Actually I got the field value by asking chatgpt, is the usage totally wrong? What could be the best way?