Not able to update the details of automated test - test type,test level & testing tool type by API

I am not able to update the automated test details like test type,test level and testing tool type by REST API POST .../api/shared_spaces/<space_id>/workspaces/<workspace_id>/test-results (https://admhelp.microfocus.com/octane/en/15.0.40/Online/Content/API/how_test-results.htm) and i am following the guide given in below link in xml payload :

https://admhelp.microfocus.com/octane/en/15.0.40/Online/Content/API/test-results.htm

 

I am getting error for test field that  "Test[0]: Field type Test Level not resolved " and below is my payload xml:

<?xml version='1.0' encoding='UTF-8'?>
<test_result>
<product_areas>
<product_area_ref id="7634"/>
</product_areas>
<test_fields>
<test_field type = "Test Level" value="System Test"/>
</test_fields>
<test_runs>
<test_run name="Regression_TC01_Test" duration="90" status="Passed" started="1587109891454">
<release name="DemoRelease"/>
<environment>
<taxonomy type="environment" value="QA"/>
</environment>
<error type="error_message" message="environment"/>
</test_run>
</test_runs>
</test_result>