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April 27, 2018 edited
Hi Steve,
New dependencies may not appear until the plan is calculated. Could you try re-calculating your plan and see if it causes your dependency to appear?
If you're running Jira in Server, there was a bug causing issues to not appear that's been fixed in 2.11.0: https://jira.atlassian.com/browse/JPOSERVER-2069. So upgrading Portfolio could fix the problem.