Linking in ALM

Hello All,

I am working on creating links and backlinks for workitems across servers.

I have written the following code :

Add a link :
private void addLink(WorkItemWorkingCopy workingCopy, IProgressMonitor monitor, IWorkItem sourceWorkItem) throws TeamRepositoryException {
            IReference targetEndpoint = getTargetEndPoint((ITeamRepository) sourceWorkItem.getOrigin(),
                    sourceWorkItem.getId());
            workingCopy.getReferences().add(fIEndPointDescriptor, targetEndpoint);
            workingCopy.save(monitor);
        }


private IReference getTargetEndPoint(ITeamRepository teamRepo, int workItemID) throws TeamRepositoryException {
            IWorkItemClient workItemClient = (IWorkItemClient) (teamRepo).getClientLibrary(IWorkItemClient.class);

            URI myURI = ItemURI.createWorkItemURI(workItemClient.getAuditableCommon(), workItemID);
            Location location = Location.location(myURI);
            IReference targetEndpoint = IReferenceFactory.INSTANCE.createReferenceFromURI(location.toAbsoluteUri());
            return targetEndpoint;
        }


Add a backlink :

private void addBackLink(IWorkItem targetWorkItem, IProgressMonitor monitor) throws TeamRepositoryException {

            WorkItemWorkingCopy workingCopy = getSourceWorkingCopy();
            IReference targetEndpoint = getTargetEndPoint((ITeamRepository) workItem.getOrigin(), targetWorkItem.getId());
            workingCopy.getReferences().add(getRequiredBackLink(), targetEndpoint);
            workingCopy.save(monitor);
        }

getSourceWorkingCopy() method gives me the source work item workingcopy and getRequiredBackLink() returns a backlink. For E.g. if link is tracks then getRequiredBackLink() will return Contributes To.

THIS CODE WORKS FOR ME IF THE WORK ITEMS ARE IN THE SAME SERVER: BUT IT DOESN'T WORK ACROSS SERVERS.
Any other suggestions ?
Thanks for the help in advance.