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Retail Banking × Compliance — Singapore · published 2026-05-28 · methodology v2.1

Mischaracterisation of yellow highlighting in MAS Notice 637 amendment PDFs

What the RLB Specialist Panel found

2. Mischaracterisation of yellow highlighting in MAS Notice 637 amendment PDFs

  • Question (paraphrased to protect IP): In MAS Notice 637 (Amendment) 2024, what do the yellow-highlighted passages signify, and will they appear in the final consolidated version of the Notice?
  • Source regulation: MAS Notice 637 (Risk Based Capital Adequacy Requirements for Banks) — Monetary Authority of Singapore (Regulator portal: https://www.mas.gov.sg)
  • What AI assistants typically say: Multiple AI tools gave similar incorrect responses, offering competing but equally inaccurate explanations: one described yellow highlighting as a general visual aid drawing attention to defined terms or cross-references; another described it as editorial annotations explaining the purpose or nature of tracked changes. Neither explanation matched the actual drafting convention used in MAS amendment PDFs.
  • What the regulator actually says: No regulator excerpt was available for direct quotation in this finding; the precise drafting convention for yellow highlighting in MAS Notice 637 amendment PDFs should be verified directly from the MAS regulatory portal and the amendment document itself.
  • Why the AI went wrong: Neither AI tool retrieved the actual MAS drafting convention. Both substituted a generic or inferred explanation — drawn from common document-marking practices — in place of the specific meaning MAS assigns to yellow highlighting in this amendment series. The result was confident but incorrect guidance on a document-reading question that directly affects how Compliance teams interpret which provisions are operative and from when.
  • Cited source(s):
Impact for this audience

A Compliance team reviewing MAS Notice 637 (Amendment) 2024 — for example, to update the firm's capital adequacy implementation timeline or identify which provisions have a deferred effective date — would use the yellow-highlighting convention to prioritise their reading. If the team accepts the AI's explanation (that highlights mark general visual aids, defined terms, or editorial annotations), they will misidentify which provisions are subject to a different operative date. This could result in the firm implementing a provision either too early or too late, creating a period of non-compliance. For provisions touching Tier 1 capital composition or RWA calculation methodologies, a timing error in implementation carries direct regulatory capital consequences and potential MAS supervisory scrutiny.

References — raw findings (per AI model)
This finding also affects
← Previous finding Finding 1. Fabricated notice designation for financial holding companies Next finding → Finding 3. Incorrect framework attribution for Annex 4D scope and exclusions
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.

Plain text 
RegLeg Specialist Panel (2026). "Mischaracterisation of yellow highlighting in MAS Notice 637 amendment PDFs — Retail Banking × Compliance — Singapore." Citation ID: . RegLegBrief AI Hallucination Research, published 2026-05-28. https://reglegbrief.com/audiences/sectors/sg/retail_banking/compliance/finding/q-NOTICE-637-CAPITAL-ADEQUACY-BANKS-2025-v1-012/
APA 7th edition 
RegLeg Specialist Panel. (2026). Mischaracterisation of yellow highlighting in MAS Notice 637 amendment PDFs [Hallucination finding ]. RegLegBrief AI Hallucination Research. https://reglegbrief.com/audiences/sectors/sg/retail_banking/compliance/finding/q-NOTICE-637-CAPITAL-ADEQUACY-BANKS-2025-v1-012/
Bluebook / OSCOLA (US + UK legal) 
RegLeg Specialist Panel, Mischaracterisation of yellow highlighting in MAS Notice 637 amendment PDFs [], RegLegBrief AI Hallucination Research (May 28, 2026), https://reglegbrief.com/audiences/sectors/sg/retail_banking/compliance/finding/q-NOTICE-637-CAPITAL-ADEQUACY-BANKS-2025-v1-012/.
BibTeX 
@misc{reglegbrief_,
  author    = {RegLeg Specialist Panel},
  title     = {Mischaracterisation of yellow highlighting in MAS Notice 637 amendment PDFs},
  year      = {2026},
  publisher = {RegLegBrief AI Hallucination Research},
  note      = {Hallucination finding Citation ID: },
  url       = {https://reglegbrief.com/audiences/sectors/sg/retail_banking/compliance/finding/q-NOTICE-637-CAPITAL-ADEQUACY-BANKS-2025-v1-012/}
}
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