That identifier is a reserved name: the research proposes the series, with the institution that publishes it and the link that would prove it, but the archive has not ingested it. Until it is fetched back from its source and stamped with a retrieval time, there is no observation to show here and no provenance numeral to open.
In depth
In research — sources cited, not yet in the verified archive
Not one of these series has entered the verified store: nothing here was fetched back from its source or stamped with a retrieval time, so no row wears the red provenance numeral and none mixes with the verified figures. The institution, the frequency and the unit are what the dossier read from the public source; the link is the one someone would still have to go and fetch. Once the archive ingests a series, it leaves this list and starts carrying provenance.