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Permanent link:
https://jazz.net/forum/questions/274379/precondition-plugin-trying-to-create-a-plugin-which-checks-the-status-of-related-change-request-workitems-and-if-any-of-the-related-change-request-workitems-are-not-in-closed-group-plugin-will-block-the-actual-workitem-from-being-closed/274385