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These keys must reference issues with the Xray issues types Test, Test Set, Test Execution or Test Plan or any issue type mapped to the Requirement issue type.
A mix of these issue types is supported. In the same export call, you can include keys from each of the above issue types. The service will build a set of Test issues based on these keys. This set will include all direct Tests issues and all Test issues associated with either Test Sets, Test Executions or Test Plans matched and all the tests for the requirements matched.
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