Agile Central - Validation Error while trying to add a Task to a defect

Document ID : KB000109633
Last Modified Date : 02/08/2018
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Issue:
While in the Agile Central application, a user is trying to add a task to a defect but is unable to do so. A red flare is returned as follows; Looks like there was a problem. Validation error: Defect.TestCase is an invalid relationship.

User-added image
Other users are receiving the same error, this user has Project administration rights. Other defects in this project did allow the user to add tasks.
Resolution:
The defect in question had one task associated but no test cases.  The defect was parented by a user story which had many test cases associated to the user story.  The user story was cleared as a parent and then tasks were able to be created under the defect. The user story was then re-parented to the defect and tasks were still able to be created.  The user story was over 2 years old and had many test cases associated to it.  It is likely that some of the associations needed to be refreshed or re-established by un-parenting and re-parenting the user story to the defect.