Requirement status of a defect created by a test execution is not correctly computed

According to documentation the link between a defect and a test could be "created by" or "tested by" link type (http://confluence.xpand-it.com/display/XRAY/Requirements+and+Defects#RequirementsandDefects-FromtheDefectissueviewscreen).
When creating a defect from a "Test execution", a "created by" link is automatically created.
In our data model a defect is a requirement. The coverage status of the defect is not correctly computed. The link "created by" between the defect and the test seems to not be taken into account in the coverage calculation. If i add manually a "tested by" link, the coverage status is correctly computed.