Item Where Used

I am looking for a report in Postbooks that shows if a part is on a BOM or not. This is not the Where Used report found at Products > Reports > Where Used (which shows what BOMs a specific item reports to), nor is it the report at Products > Utilities > Unused Purchased Items (which shows all of the items that have been entered into xTuple that have never been used, whether they report ot a BOM or not).

No, I am looking for a report that will tell me which items (or assemblies) do not report to anything, similar to the Undefined Manufactured Items report at Products > Utilities but in reverse. Does such a report exist? If so, how do I find/get it?

Thanks.

Seth