How to define dependency between two subtasks (Task A and Task B) under an issue such that task A cannot be closed until and unless task B is closed.
Hello Dinesh Agarwal!
Sorry for the delay.
Currently, JIRA only has an option to prevent the parent issue to be closed while there are still subtasks opened, however, this doesn't apply to other sub-tasks I'm afraid. An example of the current parrent-subtask condition can be found on this KB: https://confluence.atlassian.com/jirakb/preventing-issues-from-being-closed-while-their-sub-task-are-still-open-724928276.html
Use a Conditioned validator from Update on Transition for JIRA on the close issue transition. Configure a JQL query that finds issues that you care about that are not closed and if that query returns more than 0 have validator to fail with the appropriate message. Here is an example: How to use JQL to create a validator.
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