Retrieving linked Defect of a TestCaseResult using REST API in 6.0.1

Hello,

I try to geta TestCaseResult having a link to a Defect in a ProjectArea with Global Configuration enabled. (6.0.1)

My Url looks like:
...qm/service/com.ibm.rqm.integration.service.IIntegrationService/resources/pa/executionresult/urn:com.ibm.rqm:executionresult:139?oslc_config.context=_pA6UQL54EeWJMonyFqZF2w&abbreviate=false&calmlinks=true

The returned XML does not contain the link to the Defect.

Trying the same in 5.0.2 without Global Config, the result contains the Defect Link:

...qm/service/com.ibm.rqm.integration.service.IIntegrationService/resources/pa/executionresult/urn:com.ibm.rqm:executionresult:139?abbreviate=false&calmlinks=true

Can somebody please tell me if it is possible to get the link to the Defect using GC and if so, what might be wrong in my example.

Thank you.