This request is to add the validation check at the Advanced roadmap plans level if the JQL uses the function issuesInPlan("PLAN_ID")

If the user tries to use the PLAN_ID corresponding to the same plan in the issue source, it should not allow it. 

Currently, due to no such check at place, this leads to the stackoverflow error as outlined in the bug: https://jira.atlassian.com/browse/JSWSERVER-24972

The stackoverflow can cause instability on Jira nodes.

Refer:

• https://confluence.atlassian.com/jirakb/jira-data-center-stalls-due-to-stackoverflowerror-941601100.html
• https://support.atlassian.com/jira/kb/jira-applications-stalls-due-to-lost-lock-in-dbcp-pool-caused-by-stackoverflowerror/

This validation check can prevent node in going to this situation.