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ClientError: 400 FAILED_PRECONDITION. {'error': {'code': 400, 'message': 'Reasoning Engine Execution failed.\nPlease refer to our documentation (https://cloud.google.com/vertex-ai/generative-ai/docs/agent-engine/troubleshooting/use) for checking logs and other troubleshooting tips.\nError Details: ', 'status': 'FAILED_PRECONDITION'}}

1. 1

   Perimeter · Model Armor passed

   verdict

   no match

   looks like an invoice

   yes

2. 2

   Extraction passed

   invoice

   INV-2378

   vendor

   Acme Supplies

   tax id

   TAX-ACME-01-b2

   PO

   PO-1078

   date

   2026-08-19

   terms

   2/10 net 30

   total

   USD 1,863.18

   bank

   ****4417 ICIC0000123

   confidence

   1.0

   • Widgets × 10.0 @ 186.32

   Calculated total is mathematically 1863.20, but document lists 1863.18.

3. 3

   Fraud sentinel flagged

   risk score 0.45

   • prior_tampering mediumVendor memories record a prior rejected invoice (INV-2358) on 2026-08-19 due to forensic:white_on_white tampering and possible impersonation.

   Invoice INV-2378 banking details and payment terms align with the historical baseline for Acme Supplies, but vendor memory flags a prior tampering and impersonation incident on 2026-08-19.

4. 4

   Forensic · hidden text passed

   No suspicious or tampered content detected. The invoice contains standard visible billing information without hidden text or metadata discrepancies.

5. 5

   Policy gate · code flagged

   outcome

   needs_human

   3-way match

   matched

   risk tier

   high

   fraud:prior_tampering vendor on watch: a previous invoice was caught tampering
6. 6

   Human review blocked

   rejected by

   ap-manager

   note

   batch closed after the 100-invoice evaluation

7. 7

   Treasury · pay-executor not reached