I need to forbid creation of new subtasks, yet to preserve current subtasks until they finish their lifecycle. So I can't just change issue type scheme. I managed to forbid creation with workflow validator which never succeed. But I can't find how to forbid conversion from task to subtask. Any idea? tnx.
If you want to do this for your entire jira instance, the easiest way is just to disable the plugin module that provides that link.
Go to Plugins -> Issue Operations Plugin, find the module "View Issue Ops Bar Convert to Sub-Task Link", then disable that module alone.
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