Not getting linked Test cases in Test Suite using OSLC Lyo

Hi,
I have created Test Suite  class to fetch Test Suite from RQM using OSLC Lyo. Though, i am getting Description, creator, extended properties values but not getting Test Cases in Test Suite. is there something wrong in my getRunsTestCases()  method or am i missing something ?

@OslcDescription("Test Test Case used by the Test Suite.")
@OslcName("runsTestCase")
@OslcPropertyDefinition(QmConstants.QUALITY_MANAGEMENT_NAMESPACE+ "runsTestCase")
@OslcRange(QmConstants.TYPE_TEST_CASE)
@OslcReadOnly(false)
@OslcTitle("Runs Test Cases")
 public Link[] getRunsTestCases()
  {
      return runsTestCases.toArray(new Link[runsTestCases.size()]);
   }
   
public void setContributors(final URI[] contributors)
{
        this.contributors.clear();
        if (contributors != null)
        {
            this.contributors.addAll(Arrays.asList(contributors));
        }
}

public void addRunsTestCase(final Link testcase)
   {
       this.runsTestCases.add(testcase);
   }
  

QmConstants.QUALITY_MANAGEMENT_NAMESPACE = "http://open-services.net/ns/qm#"
QmConstants.TYPE_TEST_CASE = "http://open-services.net/ns/qm#TestCase"