ANSWER KEY - customer 09 (WRONG copy)
Document: Repayment receipt (RECEIPT_001)
File: 05_repayment_receipt/receipt_customer_09_wrong.pdf (2 pages)
Customer: Kavya Chopra   Lender: Ulmarin Finance (fictional)

Error type: WRONG_PAYMENT_AMOUNT - the amount received is wrong.
Page: 1
Field: the "Amount received" field under "Payment"
Correct value: ₹ 93,545.95
Printed value: ₹ 63,442.86

How it can be caught from this customer's documents:
The amount received prints ₹ 63,442.86, but the receipt's own table of how the payment was applied adds up to ₹ 93,545.95 (the receipt shows no amount held as account credit). No other published document of this customer prints ₹ 93,545.95 (searched).

Engine record:
  corruption id COR_603CBA8F1D; 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): receipt_allocation
  ... and reading only this customer's nine published documents: receipt_allocation

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