A value (35 passages, no note) of a reference (30 passages, no note)-typed frontmatter attribute (3 passages, no note) (reads, roles, rules, consumers, affects, broader among others) matches (note: Occurrence) no note (note: Note) by identifier (note: Identifier), by path relative to the source root (4 passages, no note) or by exact title, or matches several notes by title. No link (note: Link) is recorded for that value; the other values of the attribute (3 passages, no note) are unaffected. The fix is to write the identifier, the path or the exact title of an existing note, the identifier or the path when a title is shared: this repository (note: Knowledge repository) names its roles by path, roles/publication/reader, because the glossary (28 passages, no note) carries a term (note: Term) with the same title as one of them. A note found under a type (note: Type) the attribute (note: Attribute) does not accept is a relation outside the matrix, not an unresolved reference.
Check (note: Check) W-REF-UNRESOLVED, severity (note: Severity) warning by default, documented with a before and after example in the check pages. The severity can be overridden per project (note: Project) or per repository.