ANSWER KEY - customer 09 (WRONG copy)
Document: No Objection Certificate (NOC) (NOC_001)
File: 09_noc/noc_customer_09_wrong.pdf (1 page)
Customer: Kavya Chopra   Lender: Ulmarin Finance (fictional)

Error type: INVALID_NOC - the certificate is dated before the account closed.
Page: 1
Field: the "Certificate date" field in the reference box at the top of the first page
Correct value: 07 Feb 2026
Printed value: 28 Jan 2026

How it can be caught from this customer's documents:
The certificate is dated 28 Jan 2026, before the account's closure date of 06 Feb 2026, printed on the NOC itself and on the closure letter. A NOC can only be issued on or after closure; the true certificate date is 07 Feb 2026.

Engine record:
  corruption id COR_FC61541E85; mode ISOLATED (only this element was changed; nothing else was adjusted to match)
  reference detector rules whose finding names this field, with the full observation set (the documents and the event feed): noc_after_closure
  ... and reading only this customer's nine published documents: noc_after_closure

Every figure in this pack comes from a simulated ledger; this one was altered on purpose for training and testing.
