How to integrate RQM and RTC in Project Time Line part?

We are using both RQM and RTC for the same project.

Currently, RQM TestCases can be linked to corresponding RTC work item. But the iteration in TCER follows  RQM Project Time Line, which means the administrtor has to setup the same Project Time Line as it in RTC so that members can use this information to track the ER's history in different iterations. This actually creates a lot work load and increase the possibility of out-of-sync.

Any one knows how to integrate this part?

Any instruction?

Thanks in advance!

Sylvia