Issue Summary

Converting a standard issue to subtask when the parent issue key with sprint filled from the user account having no Schedule Issues or Manage sprints ends in a generic 500 error.

Steps to Reproduce

1. Create a new Story ( any other standard-issue type)
2. Use the option from the (...) from the Jira issue view -> convert to sub-task. OR use the bulk edit option to change the issue type.
3. Choose a new parent issue key that is having Sprint value filled
4. As a user who has no permissions to Schedule Issues or Manage sprints, try converting the to the sub-task

Expected Results

Jira should report messages that the user is missing the required permisison.

Actual Results

500 error message is reported

Workaround

Conversion will work from the user account having this permission

Refer - https://jira.atlassian.com/browse/JRACLOUD-78307 for error converting subtask to issue.