My plan is to directly access all work items which are related to a different, given work item. To achieve that, I thought the following queries should go fine, but nope:

https://server....com:9443/ccm/oslc/contexts/<PA-ID>/workitems?oslc.where=rtc_cm:type="com.ibm.team.apt.workItemType.epic" and rtc_cm:com.ibm.team.workitem.linktype.relatedworkitem.related="https://server....com:9443/ccm/resource/itemName/com.ibm.team.workitem.WorkItem/84"

https://server....com:9443/ccm/oslc/contexts/<PA-ID>/workitems?oslc.where=rtc_cm:type="com.ibm.team.apt.workItemType.epic" and rtc_cm:com.ibm.team.workitem.linktype.relatedworkitem.related in [<https://server....com:9443/ccm/resource/itemName/com.ibm.team.workitem.WorkItem/84>]

We have RTC 6.0.6 running.