It should be possible to ensure all requirements are covered by some Backlog item......it impossible to see now:(
From the backlog I can connect feature and user stories to requirement with the requirements column.......but the opposite doesn't exist in requirements
Please note that there are two potentially helpful workarounds right now:
1. Add a widget in the Overview dashboard - "Features by requirements" and check the option "Include empty columns in graph" to include also the requirements that don't have linked backlog items
2. Cross filter the requirements grid by "Backlog Implementation is empty"