I see exactly the same problem. As a supplier, our customer expects that we provide KPIs. E.g. what is the percentage of customer requirements covered by system requirements? And going on, how many system requirements are covered by Software requirements?
This currently is not possible to display in a widget. Only test coverage can be shown with a predefined widget.
As there is no off-the-shelve widget for coverage between arbitrary trackers, one could try to create a report and use the report widget. Unfortunately, this too isn't possible, because e.g. the field "has downstream reference" is available as filter but not as "group by".
The same request was brought up in the thread https://community.ptc.com/t5/Codebeamer-Ideas/Requirement-coverage-widget-for-down-and-uptrace-references/idi-p/995120
It was closed because of missing pictures. I don't understand why, because the request had excellent quality. A missing feature can not be captured in a screenshot. So the request for additional information was not necessary.
Codebeamer-Team, please investigate, how users can create a report or a widget to show coverage between any trackers. Please also allow to filter for item types. E.g. items of type "folders" and "information" should not be counted. Users might have other types that should be filtered.
