This rule implements threshold-based monitoring for unusually large individual transactions that carry elevated fraud risk due to their significant impact.

Triggers when:
1. A single transaction amount equals or exceeds AED 10,000
2. The currency is AED (United Arab Emirates Dirham)

High-value transactions are placed on HOLD because:
- Greater financial impact if fraud occurs
- Higher likelihood of fraud attempts (fraudsters prefer maximum gain per transaction)
- Regulatory compliance requirements for large transactions
- Increased chargeback risk for the acquiring bank

The HOLD allows fraud analysts to perform enhanced verification including merchant contact, cardholder authentication, and comparison against typical transaction patterns before authorizing release.