---
type: "AIHallucinationFinding"
title: "Which central bank chaired the CPMI working group that produced the harmonised ISO 20022 data…"
citation_id: "RLB-H-INT-BIS-CPMI-ISO-20022-HARMONISATION-UPDATED-2026-Q004-Sonnet46"
finding_uid: "INT-BIS-CPMI-INT-001-CPMI-ISO-20022-HARMONISATION-UPDATED-2026-v1-004--sonnet-46-websearch"
question_uid: "INT-BIS-CPMI-INT-001-CPMI-ISO-20022-HARMONISATION-UPDATED-2026-v1-004"
regulation_id: "INT-BIS-CPMI-INT-001-CPMI-ISO-20022-HARMONISATION-UPDATED-2026"
regulation_slug: "CPMI-ISO-20022-HARMONISATION-UPDATED-2026"
regulation_title: "Harmonised ISO 20022 Data Requirements for Enhancing Cross-Border Payments - Updated Report"
regulator_short_code: "BIS-CPMI"
regulatory_body_id: "BIS-CPMI-INT-001"
jurisdiction_code: "INT"
j_level: "J1"
ai_subject: "claude-sonnet-4-6"
ai_subject_display: "Claude Sonnet 4.6 (web search on)"
ai_subject_version: "sonnet-46-websearch"
response_failure_mode: "misattributed"
substrate_document_name: "p_09_OTHER_Governance___which_institution_chaired_t_brief10.htm"
substrate_document_path: "https://reglegbrief.com/substrate/INT/BIS-CPMI/CPMI-ISO-20022-HARMONISATION-UPDATED-2026/_raw_manual_substrate/p_09_OTHER_Governance___which_institution_chaired_t_brief10.htm"
substrate_section_anchor: "Governance — which institution chaired the CPMI messaging workstream that developed the requirements"
citation_issue_types: ["Contradictory"]
audiences: ["ai_labs"]
published_at: "2026-06-02T11:22:48.775990+00:00"
substrate_version: 1
methodology_version: "2.3"
license: "CC-BY-4.0"
resource: "https://reglegbrief.com/regulators/j1/int/bis-cpmi/CPMI-ISO-20022-HARMONISATION-UPDATED-2026/ai-labs/finding/INT-BIS-CPMI-INT-001-CPMI-ISO-20022-HARMONISATION-UPDATED-2026-v1-004--sonnet-46-websearch/"
tags: ["ai-hallucination", "misattributed", "bis-cpmi", "cpmi-iso-20022-harmonisation-updated-2026", "int"]
timestamp: "2026-06-16T00:00:00+00:00"
---

# AI Hallucination Finding: Which central bank chaired the CPMI working group that produced the harmonised ISO 20022 data…

- **Citation ID.** `RLB-H-INT-BIS-CPMI-ISO-20022-HARMONISATION-UPDATED-2026-Q004-Sonnet46`
- **Finding UID.** `INT-BIS-CPMI-INT-001-CPMI-ISO-20022-HARMONISATION-UPDATED-2026-v1-004--sonnet-46-websearch`
- **Regulation.** [`CPMI-ISO-20022-HARMONISATION-UPDATED-2026`](/okf/regulations/CPMI-ISO-20022-HARMONISATION-UPDATED-2026.md) — Harmonised ISO 20022 Data Requirements for Enhancing Cross-Border Payments - Updated Report
- **Regulator.** [`BIS-CPMI-INT-001`](/okf/bodies/BIS-CPMI-INT-001.md) — Bank for International Settlements — Committee on Payments and Market Infrastructures (CPMI)
- **AI subject.** Claude Sonnet 4.6 (web search on)
- **Failure mode.** [`misattributed`](/okf/taxonomy/failure-modes.md)
- **Published.** 2026-06-02T11:22:48.775990+00:00

## Question put to the AI subject

Which central bank chaired the CPMI working group that produced the harmonised ISO 20022 data requirements for cross-border payments?

## AI subject's verbatim answer

the specific sub-workstream chair for ISO 20022 harmonisation is attributed to the Federal Reserve Bank of New York in available public sources

## Verbatim regulator text contradicting the answer

> RBA press release (18 October 2023): 'The Reserve Bank of Australia chairs the CPMI working group that developed these requirements. Michele Bullock, RBA Governor, served as former Co-Chair of the CPMI Messaging Workstream.'

_Source:_ [p_09_OTHER_Governance___which_institution_chaired_t_brief10.htm](https://reglegbrief.com/substrate/INT/BIS-CPMI/CPMI-ISO-20022-HARMONISATION-UPDATED-2026/_raw_manual_substrate/p_09_OTHER_Governance___which_institution_chaired_t_brief10.htm)
_Section anchor:_ Governance — which institution chaired the CPMI messaging workstream that developed the requirements

## Failure mode

**`misattributed`** — Misattributed — the AI attributed a rule to the wrong source, wrong regulator, or wrong instrument.

## Citation-issue types

- **Contradictory** — <https://www.bis.org/cpmi/publ/d218.htm>
- **Contradictory** — <https://www.bis.org/press/p231017.htm>
- **Contradictory** — <https://www.bis.org/cpmi/publ/d215.pdf>

## Related concepts

- Regulation: [CPMI-ISO-20022-HARMONISATION-UPDATED-2026](/okf/regulations/CPMI-ISO-20022-HARMONISATION-UPDATED-2026.md)
- Regulator: [BIS-CPMI-INT-001](/okf/bodies/BIS-CPMI-INT-001.md)
- Failure-mode taxonomy: [misattributed](/okf/taxonomy/failure-modes.md)
- Methodology: [v2.3](/okf/methodology.md)
- Editorial standards: [right of reply](/okf/editorial-standards.md)

## Reproduction

Citation ID: `RLB-H-INT-BIS-CPMI-ISO-20022-HARMONISATION-UPDATED-2026-Q004-Sonnet46`

Resource URL (HTML view of this finding):

<https://reglegbrief.com/regulators/j1/int/bis-cpmi/CPMI-ISO-20022-HARMONISATION-UPDATED-2026/ai-labs/finding/INT-BIS-CPMI-INT-001-CPMI-ISO-20022-HARMONISATION-UPDATED-2026-v1-004--sonnet-46-websearch/>

This finding is reproducible against the substrate document linked above, using the same AI subject, the same methodology version, and the verbatim question text.