Hi there. I would like to set a post function so that when user create an issue, the value in current assignee can be copied to another custom field "Approver (Supervisor)".
Approver (Supervisor) is a User Picker (single user) field.
I tried set up with post function but "Approver (Supervisor)" is not an option in the destination field list.
The destination fields only allows the following parameter.


How can i copy the assignee to the custom field? Is there any solution to my request without add-on?
Thanks a lot!