Which central bank chaired the CPMI working group that produced the harmonised ISO 20022 data requirements for cross-border payments?
The model attributed the working-group chair role to the Federal Reserve Bank of New York — a higher-frequency institution in CPMI-adjacent content — rather than the Reserve Bank of Australia, which holds the published chair role and whose Governor served as Co-Chair of the relevant workstream. The hedge "in available public sources" is present but does not prevent the wrong attribution from being stated as the model's answer. This is a multi-body attribution failure where the less-frequently-cited institution holds the named role and the model substituted the more-frequently-cited institution from the same domain.
This failure implicates training-data density for working-group chair attribution across multi-body CPMI frameworks. The RBA press release (October 2023) naming the Reserve Bank of Australia as working-group chair exists within any plausible training window, but the model substituted the Federal Reserve Bank of New York — a higher-frequency institution in CPMI-adjacent content. The hedge 'in available public sources' signals the model detected uncertainty but did not prevent the wrong attribution from being stated.
The calibration signal for multi-body institutional role questions — where the correct answer belongs to a lower-frequency institution — is not sufficient to hold against the frequency prior.
An AI assistant asked which central bank chairs the CPMI working group behind the harmonised ISO 20022 data requirements attributed the role to the Federal Reserve Bank of New York — naming a specific individual as co-lead — when the authoritative RBA press release confirms it is the Reserve Bank of Australia, with the RBA Governor as former Co-Chair. A Compliance team at a Retail Banking firm that embeds this attribution in a board paper, a regulatory horizon-scan, or training materials for the payments business line is producing a governance narrative that is factually wrong at its foundation.
The risk is not merely reputational: if the error surfaces during a supervisory review or a correspondent-bank due-diligence exchange, the firm must either correct the record — exposing the gap in its regulatory intelligence process — or allow the error to persist in its compliance documentation.
Each finding has a stable Citation ID (RLB-F-… for aggregated case-study findings, RLB-H-… for raw per-model hallucinations) — like a DOI, the ID always resolves to the canonical finding even if URLs change.
RegLeg Specialist Panel (2026). "Finding#1 — Wrong central bank attributed as working group chair — Retail Banking × Compliance — International / Multilateral." Citation ID: RLB-F-INT-BIS-CPMI-ISO-20022-HARMONISATION-UPDATED-2026-Q004. RegLegBrief AI Hallucination Research, published 2026-06-04. https://reglegbrief.com/regulators/j1/int/bis-cpmi/cpmi-iso-20022-harmonisation-updated-2026/sectors/retail_banking/compliance/finding/INT-BIS-CPMI-INT-001-CPMI-ISO-20022-HARMONISATION-UPDATED-2026-v1-004/
RegLeg Specialist Panel. (2026). Finding#1 — Wrong central bank attributed as working group chair [Hallucination finding RLB-F-INT-BIS-CPMI-ISO-20022-HARMONISATION-UPDATED-2026-Q004]. RegLegBrief AI Hallucination Research. https://reglegbrief.com/regulators/j1/int/bis-cpmi/cpmi-iso-20022-harmonisation-updated-2026/sectors/retail_banking/compliance/finding/INT-BIS-CPMI-INT-001-CPMI-ISO-20022-HARMONISATION-UPDATED-2026-v1-004/
RegLeg Specialist Panel, Finding#1 — Wrong central bank attributed as working group chair [RLB-F-INT-BIS-CPMI-ISO-20022-HARMONISATION-UPDATED-2026-Q004], RegLegBrief AI Hallucination Research (June 04, 2026), https://reglegbrief.com/regulators/j1/int/bis-cpmi/cpmi-iso-20022-harmonisation-updated-2026/sectors/retail_banking/compliance/finding/INT-BIS-CPMI-INT-001-CPMI-ISO-20022-HARMONISATION-UPDATED-2026-v1-004/.
@misc{reglegbrief_RLB_F_INT_BIS_CPMI_ISO_20022_HARMONISATION_UPDATED_2026_Q004,
author = {RegLeg Specialist Panel},
title = {Finding#1 — Wrong central bank attributed as working group chair},
year = {2026},
publisher = {RegLegBrief AI Hallucination Research},
note = {Hallucination finding Citation ID: RLB-F-INT-BIS-CPMI-ISO-20022-HARMONISATION-UPDATED-2026-Q004},
url = {https://reglegbrief.com/regulators/j1/int/bis-cpmi/cpmi-iso-20022-harmonisation-updated-2026/sectors/retail_banking/compliance/finding/INT-BIS-CPMI-INT-001-CPMI-ISO-20022-HARMONISATION-UPDATED-2026-v1-004/}
}