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Corporate Banking × Risk — Singapore · Last updated 28 May 2026 · methodology v2.1 · Hallucination Register
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Scope and exclusions of Annex 4D under MAS Notice 637

What the RLB Specialist Panel found

1. Scope and exclusions of Annex 4D under MAS Notice 637

  • Question (paraphrased to protect IP): What does Annex 4D of the consolidated MAS Notice 637 cover, and what category of items does it explicitly exclude from its scope?
  • Source regulation: MAS Notice 637 — Notice to Banks: Capital Adequacy (Regulator portal: https://www.mas.gov.sg)
  • What AI assistants typically say: The AI described Annex 4D as setting out credit conversion factors for off-balance sheet items in the context of the leverage ratio framework, while simultaneously noting in a caveat that other search results had pointed toward the standardised approach credit risk framework instead — effectively flagging its own primary answer as potentially incorrect.
  • What the regulator actually says: No regulator excerpt was available for verification at the time of testing; the MAS Notice 637 text, including Annex 4D, is published on the MAS portal at https://www.mas.gov.sg.
  • Why the AI went wrong: The AI appears to have inferred the content of Annex 4D from framework structure and general Basel III conventions rather than retrieving the actual annex text, and its self-contradicting caveat confirms it lacked a reliable source. Presenting an uncertain inference as a primary answer — even with a buried qualification — creates a meaningful risk that a reader accepts the opening framing without registering the caveat.
  • Cited source(s):
Impact for Risk Teams in Corporate Banking Sector in Singapore working with the AI Hallucinations Affecting Risk at Corporate Banking Firms in Singapore

A Risk team that relies on the AI's framing of Annex 4D risks misclassifying off-balance sheet items in the wrong framework — either incorrectly applying leverage ratio treatment to items governed by the standardised approach credit risk rules, or vice versa. If this mischaracterisation enters an internal capital model methodology document or a credit approval policy, it may propagate through every transaction assessed against that framework until corrected.

MAS has the authority to require capital remediation and a formal methodology review where it finds that a bank's internal processes have not correctly applied the operative Notice, and the cost of a firm-wide correction — across models, policies, and training materials — will significantly exceed the cost of the original verification step.

Next finding → Content of Annex 6C under MAS Notice 637
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Plain text Download 
RegLeg Specialist Panel (2026). "Scope and exclusions of Annex 4D under MAS Notice 637 — Corporate Banking × Risk — Singapore." Citation ID: . RegLegBrief AI Hallucination Research, published 2026-05-28. https://reglegbrief.com/audiences/sectors/sg/corporate_banking/risk/finding/q-NOTICE-637-CAPITAL-ADEQUACY-BANKS-2025-v1-017/
APA 7th edition Download 
RegLeg Specialist Panel. (2026). Scope and exclusions of Annex 4D under MAS Notice 637 [Hallucination finding ]. RegLegBrief AI Hallucination Research. https://reglegbrief.com/audiences/sectors/sg/corporate_banking/risk/finding/q-NOTICE-637-CAPITAL-ADEQUACY-BANKS-2025-v1-017/
Bluebook / OSCOLA (US + UK legal) Download 
RegLeg Specialist Panel, Scope and exclusions of Annex 4D under MAS Notice 637 [], RegLegBrief AI Hallucination Research (May 28, 2026), https://reglegbrief.com/audiences/sectors/sg/corporate_banking/risk/finding/q-NOTICE-637-CAPITAL-ADEQUACY-BANKS-2025-v1-017/.
BibTeX Download 
@misc{reglegbrief_,
  author    = {RegLeg Specialist Panel},
  title     = {Scope and exclusions of Annex 4D under MAS Notice 637},
  year      = {2026},
  publisher = {RegLegBrief AI Hallucination Research},
  note      = {Hallucination finding Citation ID: },
  url       = {https://reglegbrief.com/audiences/sectors/sg/corporate_banking/risk/finding/q-NOTICE-637-CAPITAL-ADEQUACY-BANKS-2025-v1-017/}
}
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Every finding on this page compares an AI subject's account of the rule against the regulator's verbatim text from the regulator's own portal. Both are linked. Each delta, its root causes, and impact analysis are documented and published with immutable Citation IDs.