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What happens when the evidence is not good enough?
Part of How a flow is decided. Declining to answer is one of the outcomes at every stage of it.
The consensus matching step applies updates only under explicit confidence
rules — typically several independent sources agreeing. When they do not agree,
it does not guess. Instead the case goes into a queue in review_queue, and
/queue/<name> is where a human decides it:
| Situation | Queue |
|---|---|
| Common Chemistry disagrees with the flow's name for a CAS | commonchem-cas-name-differences |
| Common Chemistry gives a different CAS for the flow's name | commonchem-name-cas |
| A CAS resolves to several ChEBI records ambiguously | cas-ambiguous |
| No EC number can be recovered from the string at all | ec-malformed |
| CAS ↔ EC pairing contradicts the ECHA inventory | ec-cross-check |
| Consensus matching found no confident answer | consensus-match |
| A preferred-label rename is awaiting a ruling | undecided-label-replacement |
| A land-class substance has a flow published outside Land Use | land-class-out-of-place |
| Two live flows share a substance, a context and a unit, and a comment is all that separates them | elementary-flow-collision |
| A ChEBI record's formula diverges from the flow's | formula_mismatches table |
| An element has no flow object | element_coverage table |
| An ecoinvent flow matched no consensus flow object | merge_outcomes table |
Declining to act is a normal outcome, not a failure. See The review application for how to work through these queues.