Practitioners — Accountants (CA/PA) · Last updated 11 Jun 2026 · Hallucination Register

Finding#1 . Fabricated 'Notice FHC-N637' for financial holding companies

RLB Citation ID: RLB-F-SG-MAS-NOTICE-637-CAPITAL-ADEQUACY-BANKS-2025-Q010

AI's failure:Exposed Fabrication Risk for Accountants (CA/PA):Regulatory enforcement / professional liability exposure

What the RLB Specialist Panel found

Finding#1 . Fabricated 'Notice FHC-N637' for financial holding companies

Citation ID: RLB-H-SG-MAS-NOTICE-637-CAPITAL-ADEQUACY-BANKS-2025-Q010-Opus47
AI's failure: AI confidently issued a fabricated regulatory instrument that does not exist
Risk for the Accountants (CA/PA): Professional liability and regulatory enforcement exposure where the published MAS text resolves the question differently For an accountant preparing a capital-instrument classification memorandum at the group level (where the bank operates under a Singapore financial holding company), an AI that asserts 'Notice FHC-N637' as the applicable regulatory basis produces a memo that records a non-existent instrument as the source of the classification position. Notice 637 paragraph 11.2.2 resolves the FHC scope question by reference to whether the holding company is subject to requirements similar to Part VII of Notice 637 itself. A classification memo built on the fabricated notice carries the regulatory-basis error into the capital adequacy computation, the Pillar 3 disclosure, and the regulatory return; the downstream reporting products inherit the wrong basis at every stage.
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Impact for Accountants (CA/PA) in Singapore advising on the MAS Notice 637 (Amendment) 2025 - Risk Based Capital Adequacy Requirements for Banks Incorporated in Singapore

Accountants advising Singapore-incorporated FHCs on group capital reporting need precise instrument references when classifying regulatory adjustments and capital deductions. Opus 4.7's fabricated "Notice FHC-N637" would produce a citation in a capital reporting workpaper that does not resolve to any MAS instrument, exposing the engagement to review queries from the engagement partner or ACRA. The correct framework is MAS's separate FHC notice issued under the Financial Holding Companies Act; accountants should source notice references directly from the MAS register before incorporating them into client deliverables.

References — raw findings (per AI model)

RLB-H-SG-MAS-NOTICE-637-CAPITAL-ADEQUACY-BANKS-2025-Q010-Opus47 Claude Opus 4.7 (web search on)

Next finding → Finding#2 . Misrepresented yellow-highlight meaning in MAS amendment PDFs

Cite this finding

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.

RLB Citation ID: RLB-F-SG-MAS-NOTICE-637-CAPITAL-ADEQUACY-BANKS-2025-Q010

Plain text Download

RegLeg Specialist Panel (2026). "Finding#1 . Fabricated 'Notice FHC-N637' for financial holding companies — Practitioners — Accountants (CA/PA)." Citation ID: RLB-F-SG-MAS-NOTICE-637-CAPITAL-ADEQUACY-BANKS-2025-Q010. RegLegBrief AI Hallucination Research, published 2026-06-11. https://reglegbrief.com/regulators/j3/sg/MAS/NOTICE-637-CAPITAL-ADEQUACY-BANKS-2025/practitioners/accountants-ca-pa/finding/SG-MAS-SG-001-NOTICE-637-CAPITAL-ADEQUACY-BANKS-2025-v1-010/

APA 7th edition Download

RegLeg Specialist Panel. (2026). Finding#1 . Fabricated 'Notice FHC-N637' for financial holding companies [Hallucination finding RLB-F-SG-MAS-NOTICE-637-CAPITAL-ADEQUACY-BANKS-2025-Q010]. RegLegBrief AI Hallucination Research. https://reglegbrief.com/regulators/j3/sg/MAS/NOTICE-637-CAPITAL-ADEQUACY-BANKS-2025/practitioners/accountants-ca-pa/finding/SG-MAS-SG-001-NOTICE-637-CAPITAL-ADEQUACY-BANKS-2025-v1-010/

Bluebook / OSCOLA (US + UK legal) Download

RegLeg Specialist Panel, Finding#1 . Fabricated 'Notice FHC-N637' for financial holding companies [RLB-F-SG-MAS-NOTICE-637-CAPITAL-ADEQUACY-BANKS-2025-Q010], RegLegBrief AI Hallucination Research (June 11, 2026), https://reglegbrief.com/regulators/j3/sg/MAS/NOTICE-637-CAPITAL-ADEQUACY-BANKS-2025/practitioners/accountants-ca-pa/finding/SG-MAS-SG-001-NOTICE-637-CAPITAL-ADEQUACY-BANKS-2025-v1-010/.

BibTeX Download

@misc{reglegbrief_RLB_F_SG_MAS_NOTICE_637_CAPITAL_ADEQUACY_BANKS_2025_Q010,
  author    = {RegLeg Specialist Panel},
  title     = {Finding#1 . Fabricated 'Notice FHC-N637' for financial holding companies},
  year      = {2026},
  publisher = {RegLegBrief AI Hallucination Research},
  note      = {Hallucination finding Citation ID: RLB-F-SG-MAS-NOTICE-637-CAPITAL-ADEQUACY-BANKS-2025-Q010},
  url       = {https://reglegbrief.com/regulators/j3/sg/MAS/NOTICE-637-CAPITAL-ADEQUACY-BANKS-2025/practitioners/accountants-ca-pa/finding/SG-MAS-SG-001-NOTICE-637-CAPITAL-ADEQUACY-BANKS-2025-v1-010/}
}

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