Unable to resolve Epic Issue with children issues closed
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Note that this KB was created for the Data Center version of the product. Data Center KBs for non-Data-Center-specific features may also work for Server versions of the product, however they have not been tested. Support for Server* products ended on February 15th 2024. If you are running a Server product, you can visit the Atlassian Server end of support announcement to review your migration options.
*Except Fisheye and Crucible
Summary
When trying to close an Epic, Jira's workflow validator returns a message that all epic children should be resolved before allow to close the Epic.
However, when editing the Epic, all linked issues and child issues are already in the Closed state.

Cause
The condition created at the validator is using the clause "Linked issue belongs to same Project as current issue" and there is an issue linked to this Epic from another Project Area.

Solution
Remove the clause "Linked issue belongs to same Project as current issue" or remove the link between the Epic and the issue from the other Project.
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