AI Hallucination Research › Audiences › Sectors › Singapore › Retail Banking › Legal › Detail › Finding
Retail Banking × Legal — Singapore · published 2026-05-28 · methodology v2.1

Misidentification of yellow-highlighting convention in MAS amendment notice

What the RLB Specialist Panel found

2. Misidentification of yellow-highlighting convention in MAS amendment notice

  • 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 (Amendment) 2024 — Risk Based Capital Adequacy Requirements for Banks (Singapore) (Regulator portal: https://www.mas.gov.sg)
  • What AI assistants typically say: Multiple AI tools gave similar incorrect responses. One described yellow highlighting as a generic visual aid used to draw attention to defined terms, cross-references, or passages the reader should note during review. Another characterised highlighted text as editorial annotations explaining the purpose or nature of tracked changes. Neither response identified the specific, precise function that yellow highlighting serves in MAS amendment documents.
  • What the regulator actually says: In MAS Notice 637 amendment PDFs, yellow highlighting is a specific drafting convention marking provisions that carry a different effective date from the general operative date of the amendment — a distinction with direct compliance significance for any firm sequencing implementation.
  • Why the AI went wrong: The AI tools substituted generic inference for precise regulatory knowledge. Because yellow highlighting can serve different purposes across different document types, the AI defaulted to plausible general descriptions rather than identifying the convention as it actually functions in this specific MAS instrument. The result is an answer that sounds reasonable but would cause a Legal team to misread the amendment document's effective-date structure.
  • Cited source(s):
Impact for this audience

A Legal team that accepts the AI's generic description of yellow highlighting — as a visual aid, defined-term marker, or editorial annotation — will misread the MAS Notice 637 (Amendment) 2024 document and produce a gap analysis or implementation timeline based on incorrect effective dates. Provisions that carry a later operative date than the general amendment date could be treated as immediately effective, causing the firm to over-commit resources or mis-sequence compliance steps; alternatively, provisions could be treated as not yet operative when they already are, leaving the firm in breach. Since gap analyses and implementation plans in this area typically feed into board-level reporting and MAS supervisory submissions, an error introduced at the document-reading stage compounds across every downstream work-product. Remediation would require re-running the affected analyses and potentially correcting submissions already made.

References — raw findings (per AI model)
This finding also affects
← Previous finding Finding 1. Fabricated notice designation for financial holding companies
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). "Misidentification of yellow-highlighting convention in MAS amendment notice — Retail Banking × Legal — Singapore." Citation ID: . RegLegBrief AI Hallucination Research, published 2026-05-28. https://reglegbrief.com/audiences/sectors/sg/retail_banking/legal/finding/q-NOTICE-637-CAPITAL-ADEQUACY-BANKS-2025-v1-012/
APA 7th edition 
RegLeg Specialist Panel. (2026). Misidentification of yellow-highlighting convention in MAS amendment notice [Hallucination finding ]. RegLegBrief AI Hallucination Research. https://reglegbrief.com/audiences/sectors/sg/retail_banking/legal/finding/q-NOTICE-637-CAPITAL-ADEQUACY-BANKS-2025-v1-012/
Bluebook / OSCOLA (US + UK legal) 
RegLeg Specialist Panel, Misidentification of yellow-highlighting convention in MAS amendment notice [], RegLegBrief AI Hallucination Research (May 28, 2026), https://reglegbrief.com/audiences/sectors/sg/retail_banking/legal/finding/q-NOTICE-637-CAPITAL-ADEQUACY-BANKS-2025-v1-012/.
BibTeX 
@misc{reglegbrief_,
  author    = {RegLeg Specialist Panel},
  title     = {Misidentification of yellow-highlighting convention in MAS amendment notice},
  year      = {2026},
  publisher = {RegLegBrief AI Hallucination Research},
  note      = {Hallucination finding Citation ID: },
  url       = {https://reglegbrief.com/audiences/sectors/sg/retail_banking/legal/finding/q-NOTICE-637-CAPITAL-ADEQUACY-BANKS-2025-v1-012/}
}
← Back to case study summary Case study detail →
About Citation IDs →