Rally - Receive Red Flag 'null' error when selecting Test Case for collection

Products

• Rally On-Premise
• Rally SaaS

Issue/Introduction

I got “NULL” red flag error when trying to add a Test Case to the collections page.

Environment

Release:
Component: ACSAAS

Resolution

The user was attempting to add the same Test Case as part of the defect collection (children) when it already existed as a parent to the defect.  This is not allowed and hence the error is thrown.