After moving a parent issue of a subtask, user is unable to search the old issue key of these moved subtasks. When trying to search the old issue key, an error message will appear "

The issue you are trying to view does not exist.
If you think this message is wrong, please contact your JIRA administrators.
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New issue key can be search.

Resolution
This issue does not occur in newer JIRA versions. Upgrade JIRA to 6.2 or later to resolve this.
Cannot search old issue key of subtask when parent issue is moved to another project