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.
When AI tools are asked which central bank chairs the CPMI working group behind the harmonised ISO 20022 data requirements, tested AI assistants attributed the role to the Federal Reserve Bank of New York and named a fabricated individual as co-lead — when the Reserve Bank of Australia is confirmed chair and Michele Bullock served as former Co-Chair. For a Legal team at a Payment Institutions firm, this error surfaces in regulatory mapping documents, board briefings, and counterparty submissions that reference the governance pedigree of the harmonised requirements.
A document filed with a competent authority or shared with a correspondent banking partner that misidentifies the scheme's institutional author requires formal correction and risks signalling to the regulator or counterparty that the firm's Legal function has not engaged with the primary record. In internationally active Payment Institutions where the same briefing template is adapted across corridors, a single AI-originated misattribution can propagate simultaneously into multiple markets before discovery — compounding the remediation burden across jurisdictions.
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 — CPMI workstream chair misattributed to wrong central bank — Payment Institutions × Legal — 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/payment_institutions/legal/finding/INT-BIS-CPMI-INT-001-CPMI-ISO-20022-HARMONISATION-UPDATED-2026-v1-004/
RegLeg Specialist Panel. (2026). Finding#1 — CPMI workstream chair misattributed to wrong central bank [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/payment_institutions/legal/finding/INT-BIS-CPMI-INT-001-CPMI-ISO-20022-HARMONISATION-UPDATED-2026-v1-004/
RegLeg Specialist Panel, Finding#1 — CPMI workstream chair misattributed to wrong central bank [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/payment_institutions/legal/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 — CPMI workstream chair misattributed to wrong central bank},
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/payment_institutions/legal/finding/INT-BIS-CPMI-INT-001-CPMI-ISO-20022-HARMONISATION-UPDATED-2026-v1-004/}
}