FLX-5031: a column named by the fidelity block is not a member of the expose

Family: numerics (the 5000 band)

SEAM-FIDELITY-SPEC §2: every column and every groupBy is a member of the referenced expose schema. A column the expose does not declare has no type, no position in the emitted row, and no committed counterpart, so the block is refused offline rather than failing at check time.

Look it up offline

$ fluxsim explain FLX-5031

Every code is listed in the error index.