When searching for an article based on it's source ID, composer also returns any article that includes the story as a "related item", making it harder for the user to determine which article is the actual one they are looking for. Currently, we can filter by the name of the "source", but that doesn't eliminate the issue. It would be very helpful if we could also filter by the "source id", returning only the article that has that value in that field.
tl;dr - Add a filter/option/etc that filters composer results based on the "source id" field, excluding any item that may have the target content as a related item.