This rule detects potential compromise of chip-based EMV cards being used with degraded security modes that bypass chip authentication.

System alerts when:
1. Transaction amount exceeds AED 50
2. The entry mode is either:
   - Code 80: Fallback (chip read failed, fell back to magstripe)
   - Code 90: Magstripe (bypassed chip entirely)
3. Card should have chip capability but isn't using it

This combination is suspicious because:
- High-value fallback transactions are uncommon (most chips work reliably)
- Fraudsters deliberately damage chips to force fallback to less secure magstripe
- Counterfeit cards may fail chip authentication but work via magstripe
- Compromised terminals may force fallback mode to avoid chip security

Generates an ALERT for analyst review while allowing transaction to proceed under enhanced monitoring.