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Retail Banking × Risk — Singapore · Last updated 11 Jun 2026 · Hallucination Register
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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 Retail Banking × Risk: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 Risk team: Regulatory enforcement exposure on MAS supervisory engagement where the bank's records misstate the regulatory basis For a corporate banking risk function capturing the capital adequacy risk framework at the holding company level, an AI that asserts a parallel 'Notice FHC-N637' produces risk policy documentation that cites a non-existent regulatory instrument as the source of capital adequacy obligation. Notice 637 paragraph 11.2.2 itself resolves the question. Risk policy citing the fabricated parallel notice creates direct regulatory enforcement risk on MAS supervisory engagement, and creates risk-governance exposure on internal audit review of the risk function's regulatory-basis documentation.
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Impact for Risk Teams in Retail Banking Sector in Singapore working with the MAS Notice 637 (Amendment) 2025 - Risk Based Capital Adequacy Requirements for Banks Incorporated in Singapore

Retail-banking risk teams responsible for the regulatory-capital view of a Reporting Bank that sits inside an FHC structure need precise framework references. Opus 4.7's fabrication of "Notice FHC-N637" would, if relied on in a regulatory-framework map, drive RWA classification and capital-buffer calibration through a non-existent instrument and produce limit and stress-test outputs that cannot be reconciled to any MAS source. Risk should source every notice reference from the MAS register; the FHC-level framework is MAS's separate notice under the Financial Holding Companies Act.

References — raw findings (per AI model)
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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 — Retail Banking × Risk — Singapore." 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/sectors/retail_banking/risk/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/sectors/retail_banking/risk/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/sectors/retail_banking/risk/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/sectors/retail_banking/risk/finding/SG-MAS-SG-001-NOTICE-637-CAPITAL-ADEQUACY-BANKS-2025-v1-010/}
}
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