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advanced·Finance & FP&A·2 hours

Duplicate Payment Detection Sweep

A scored duplicate-payment hit list with recurring-charge false positives excluded, recovery letters drafted, and preventive controls mapped to actual findings.

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Recommended modelClaude Sonnet 4.6

Long context for multi-document FP&A analysis

What you need to fill in

[paste 6–12 months: payment date, vendor, invoice ref, amount, bank account]

Tools used

ClaudeExcel

The prompt

"Run a duplicate-payment risk sweep over this AP payment history: [paste 6–12 months: payment date, vendor, invoice ref, amount, bank account]. Please: 1. Apply layered matching: exact (vendor+ref+amount), fuzzy ref (INV-123 vs 123/INV), same amount ±0 days across *different* vendor IDs (the vendor-master-duplicate case), and split-then-full payments 2. Score each hit by likelihood and recovery value; exclude plausible recurring charges (rent, leases) with reasoning 3. Draft the vendor recovery letter for confirmed duplicates 4. Recommend the 3 preventive controls that would have caught the top hits at entry"
Open in Claude

Sample output

**Hits: 9 candidates, est. recovery 61k** 1. **HIGH (23,400):** V1004 'INV-8812' paid 03-14 and V2381 'inv 8812' paid 03-28 — same IBAN, vendor-master duplicate. → recovery letter drafted. 2. **HIGH (18,000):** ref '2026-044' paid as 9,000 × 2 (04-02) then full 18,000 (04-30) after vendor re-sent statement. 3. *Excluded:* 12 × 4,150 monthly to V3300 — matches lease contract cadence. **Preventive controls:** normalise invoice refs on entry (strip separators); block same-IBAN different-vendor-ID; statement-vs-ledger match before re-payment.

Try with these tools

claudeclaude codechatgpt
financeaccounts-payableduplicate-paymentsaudit

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