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near_duplicate

near_duplicate-2026350004

A double-booked payment that cannot be told from a real one.

expects near_duplicate

Statement files

1 highlighted lines differ from the same seed rendered without perturbations. That difference is the trap.

bnp_camt053.xmlUntouched by this perturbation
<?xml version='1.0' encoding='utf-8'?>
<Document xmlns="urn:iso:std:iso:20022:tech:xsd:camt.053.001.02">
<BkToCstmrStmt>
<GrpHdr>
<MsgId>LB-acct-2026350004-2-2025-11-30</MsgId>
<CreDtTm>2025-11-30T23:59:00+00:00</CreDtTm>
</GrpHdr>
<Stmt>
<Id>acct-2026350004-2</Id>
<ElctrncSeqNb>1</ElctrncSeqNb>
<CreDtTm>2025-11-30T23:59:00+00:00</CreDtTm>
<FrToDt>
<FrDtTm>2025-11-01T00:00:00+00:00</FrDtTm>
<ToDtTm>2025-11-30T23:59:59+00:00</ToDtTm>
</FrToDt>
<Acct>
<Id>
<IBAN>GB62LBEN73687565129927</IBAN>
</Id>
<Ccy>GBP</Ccy>
</Acct>
<Bal>
<Tp>
<CdOrPrtry>
<Cd>OPBD</Cd>
</CdOrPrtry>
</Tp>
<Amt Ccy="GBP">183026.23</Amt>
<CdtDbtInd>CRDT</CdtDbtInd>
<Dt>
<Dt>2025-11-01</Dt>
</Dt>
</Bal>
<Ntry>
<Amt Ccy="GBP">12718.65</Amt>
<CdtDbtInd>CRDT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-11-05</Dt>
</BookgDt>
<ValDt>
<Dt>2025-11-05</Dt>
</ValDt>
<AcctSvcrRef>acct-2026350004-2-t001</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>FPI HARBOURLIGHT IT REF138034</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">7102.71</Amt>
<CdtDbtInd>CRDT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-11-08</Dt>
</BookgDt>
<ValDt>
<Dt>2025-11-08</Dt>
</ValDt>
<AcctSvcrRef>acct-2026350004-2-t008</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>FPI IRONBRIDGE TOOLING REF302849</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">10565.42</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-11-08</Dt>
</BookgDt>
<ValDt>
<Dt>2025-11-08</Dt>
</ValDt>
<AcctSvcrRef>acct-2026350004-2-t020</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>SO OSPREY LEASING REF559729</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">4367.15</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-11-09</Dt>
</BookgDt>
<ValDt>
<Dt>2025-11-09</Dt>
</ValDt>
<AcctSvcrRef>acct-2026350004-2-t002</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>FPO IRONBRIDGE TOOLING REF301804</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">13847.20</Amt>
<CdtDbtInd>CRDT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-11-12</Dt>
</BookgDt>
<ValDt>
<Dt>2025-11-12</Dt>
</ValDt>
<AcctSvcrRef>acct-2026350004-2-t014</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>FPI FENWICK &amp; PARTNERS REF794539</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">5931.21</Amt>
<CdtDbtInd>CRDT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-11-14</Dt>
</BookgDt>
<ValDt>
<Dt>2025-11-14</Dt>
</ValDt>
<AcctSvcrRef>acct-2026350004-2-t016</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>CR GREENHOLM FOODS REF820474</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">3350.74</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-11-14</Dt>
</BookgDt>
<ValDt>
<Dt>2025-11-14</Dt>
</ValDt>
<AcctSvcrRef>acct-2026350004-2-t019</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>DD FENWICK &amp; PARTNERS REF653294</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">14809.92</Amt>
<CdtDbtInd>CRDT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-11-17</Dt>
</BookgDt>
<ValDt>
<Dt>2025-11-17</Dt>
</ValDt>
<AcctSvcrRef>acct-2026350004-2-t004</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>CR IRONBRIDGE TOOLING REF170792</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">4240.52</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-11-17</Dt>
</BookgDt>
<ValDt>
<Dt>2025-11-17</Dt>
</ValDt>
<AcctSvcrRef>acct-2026350004-2-t012</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>SO HARBOURLIGHT IT REF793150</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">1087.70</Amt>
<CdtDbtInd>CRDT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-11-20</Dt>
</BookgDt>
<ValDt>
<Dt>2025-11-20</Dt>
</ValDt>
<AcctSvcrRef>acct-2026350004-2-t018</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>FPI FENWICK &amp; PARTNERS REF505430</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">3197.27</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-11-21</Dt>
</BookgDt>
<ValDt>
<Dt>2025-11-21</Dt>
</ValDt>
<AcctSvcrRef>acct-2026350004-2-t007</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>FPO JUNIPER PAYROLL REF111445</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">13727.22</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-11-22</Dt>
</BookgDt>
<ValDt>
<Dt>2025-11-22</Dt>
</ValDt>
<AcctSvcrRef>acct-2026350004-2-t005</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>BP AURORA CONSULTING LTD REF167133</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">4917.30</Amt>
<CdtDbtInd>CRDT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-11-24</Dt>
</BookgDt>
<ValDt>
<Dt>2025-11-24</Dt>
</ValDt>
<AcctSvcrRef>acct-2026350004-2-t009</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>FPI AURORA CONSULTING LTD REF275725</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">1061.00</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-11-24</Dt>
</BookgDt>
<ValDt>
<Dt>2025-11-24</Dt>
</ValDt>
<AcctSvcrRef>acct-2026350004-2-t011</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>BP KESTREL INSURANCE REF330745</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">901.46</Amt>
<CdtDbtInd>CRDT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-11-25</Dt>
</BookgDt>
<ValDt>
<Dt>2025-11-25</Dt>
</ValDt>
<AcctSvcrRef>acct-2026350004-2-t013</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>CR GREENHOLM FOODS REF640667</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">5767.02</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-11-26</Dt>
</BookgDt>
<ValDt>
<Dt>2025-11-26</Dt>
</ValDt>
<AcctSvcrRef>acct-2026350004-2-t003</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>BP NORTHGATE CLEANING REF599505</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">12384.65</Amt>
<CdtDbtInd>CRDT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-11-26</Dt>
</BookgDt>
<ValDt>
<Dt>2025-11-26</Dt>
</ValDt>
<AcctSvcrRef>acct-2026350004-2-t006</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>CR MOORLAND TELECOM REF497000</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">7313.55</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-11-28</Dt>
</BookgDt>
<ValDt>
<Dt>2025-11-28</Dt>
</ValDt>
<AcctSvcrRef>acct-2026350004-2-t010</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>DD FENWICK &amp; PARTNERS REF169596</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">6470.23</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-11-30</Dt>
</BookgDt>
<ValDt>
<Dt>2025-11-30</Dt>
</ValDt>
<AcctSvcrRef>acct-2026350004-2-t015</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>BP NORTHGATE CLEANING REF718291</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">14301.78</Amt>
<CdtDbtInd>CRDT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-11-30</Dt>
hsbc_statement.xlsxUntouched by this perturbation
[sheet: Statement]
HSBC Bank plc
Business Current Account Statement
Account name: LEDGERBENCH DEMO LTD
Sort code / Account number: 63-65-35 17962362
Account reference: acct-2026350004-1
Statement period: 01 Nov 2025 to 30 Nov 2025
Currency: GBP
Opening balance: 76346.48
Date Payment type Details Paid out Paid in
04 Nov 2025 DD GREENHOLM FOODS REF517448 450.61
06 Nov 2025 TFR FENWICK & PARTNERS REF338574 8003.47
06 Nov 2025 FPO GREENHOLM FOODS REF287159 3320.92
08 Nov 2025 FPO HARBOURLIGHT IT REF463230 8916.25
08 Nov 2025 SO LARKSPUR TRAVEL REF564947 12707.26
09 Nov 2025 SO IRONBRIDGE TOOLING REF229738 5711.51
10 Nov 2025 CR AURORA CONSULTING LTD REF190103 3825.45
10 Nov 2025 BP LARKSPUR TRAVEL REF134251 12502.76
11 Nov 2025 BP AURORA CONSULTING LTD REF357201 1825.52
12 Nov 2025 BP CASTLEGATE PROPERTY REF966010 316.57
13 Nov 2025 FPI IRONBRIDGE TOOLING REF691962 2059.83
14 Nov 2025 DD BRAMBLE LOGISTICS REF692076 3344.83
15 Nov 2025 TFR AURORA CONSULTING LTD REF381923 7838.33
17 Nov 2025 CR FENWICK & PARTNERS REF862259 10235.28
18 Nov 2025 DD FENWICK & PARTNERS REF626477 9872.26
23 Nov 2025 BP CASTLEGATE PROPERTY REF905810 14194.24
25 Nov 2025 DD DELPHINIUM MEDIA REF457980 767.22
25 Nov 2025 DD JUNIPER PAYROLL REF917980 85.08
25 Nov 2025 FPO KESTREL INSURANCE REF533292 12852.63
25 Nov 2025 BP NORTHGATE CLEANING REF523327 1143.47
25 Nov 2025 BP JUNIPER PAYROLL REF231358 2488.15
rbs_transactions.csv1 changed line · first at line 31
"Date","Type","Description","Value","Account Name","Account Number","Ledger Ref"
"01/11/2025","BAL","OPENING BALANCE","152736.53","LEDGERBENCH DEMO LTD","73-78-85 27346923","acct-2026350004-3"
"01/11/2025","FPI","FPI CASTLEGATE PROPERTY REF560167","6532.87","LEDGERBENCH DEMO LTD","73-78-85 27346923","acct-2026350004-3"
"04/11/2025","SO","SO DELPHINIUM MEDIA REF718015","-7521.04","LEDGERBENCH DEMO LTD","73-78-85 27346923","acct-2026350004-3"
"04/11/2025","DD","DD LARKSPUR TRAVEL REF433725","-14828.59","LEDGERBENCH DEMO LTD","73-78-85 27346923","acct-2026350004-3"
"05/11/2025","FPI","FPI MOORLAND TELECOM REF902677","12249.19","LEDGERBENCH DEMO LTD","73-78-85 27346923","acct-2026350004-3"
"06/11/2025","FPO","FPO HARBOURLIGHT IT REF299402","-10328.56","LEDGERBENCH DEMO LTD","73-78-85 27346923","acct-2026350004-3"
"07/11/2025","CR","CR MOORLAND TELECOM REF734477","12029.50","LEDGERBENCH DEMO LTD","73-78-85 27346923","acct-2026350004-3"
"07/11/2025","FPO","FPO HARBOURLIGHT IT REF475333","-12516.30","LEDGERBENCH DEMO LTD","73-78-85 27346923","acct-2026350004-3"
"08/11/2025","FPO","FPO MOORLAND TELECOM REF818827","-3745.70","LEDGERBENCH DEMO LTD","73-78-85 27346923","acct-2026350004-3"
"09/11/2025","FPO","FPO MOORLAND TELECOM REF495792","-2569.94","LEDGERBENCH DEMO LTD","73-78-85 27346923","acct-2026350004-3"
"09/11/2025","FPI","FPI GREENHOLM FOODS REF236911","12560.68","LEDGERBENCH DEMO LTD","73-78-85 27346923","acct-2026350004-3"
"12/11/2025","CR","CR GREENHOLM FOODS REF303940","2034.32","LEDGERBENCH DEMO LTD","73-78-85 27346923","acct-2026350004-3"
"12/11/2025","DD","DD AURORA CONSULTING LTD REF695692","-3417.46","LEDGERBENCH DEMO LTD","73-78-85 27346923","acct-2026350004-3"
"14/11/2025","SO","SO BRAMBLE LOGISTICS REF584397","-14975.43","LEDGERBENCH DEMO LTD","73-78-85 27346923","acct-2026350004-3"
"15/11/2025","TFR","TFR HARBOURLIGHT IT REF106317","10649.95","LEDGERBENCH DEMO LTD","73-78-85 27346923","acct-2026350004-3"
"18/11/2025","TFR","TFR EASTFIELD ENERGY REF862532","6454.27","LEDGERBENCH DEMO LTD","73-78-85 27346923","acct-2026350004-3"
"19/11/2025","DD","DD CASTLEGATE PROPERTY REF513759","-8125.25","LEDGERBENCH DEMO LTD","73-78-85 27346923","acct-2026350004-3"
"19/11/2025","FPI","FPI FENWICK & PARTNERS REF474643","222.29","LEDGERBENCH DEMO LTD","73-78-85 27346923","acct-2026350004-3"
"20/11/2025","SO","SO AURORA CONSULTING LTD REF243549","-8967.20","LEDGERBENCH DEMO LTD","73-78-85 27346923","acct-2026350004-3"
"20/11/2025","DD","DD BRAMBLE LOGISTICS REF303809","-8088.33","LEDGERBENCH DEMO LTD","73-78-85 27346923","acct-2026350004-3"
"24/11/2025","DD","DD DELPHINIUM MEDIA REF575299","-13898.70","LEDGERBENCH DEMO LTD","73-78-85 27346923","acct-2026350004-3"
"24/11/2025","TFR","TFR NORTHGATE CLEANING REF350634","7467.08","LEDGERBENCH DEMO LTD","73-78-85 27346923","acct-2026350004-3"
"24/11/2025","SO","SO LARKSPUR TRAVEL REF649557","-10422.70","LEDGERBENCH DEMO LTD","73-78-85 27346923","acct-2026350004-3"
"24/11/2025","TFR","TFR IRONBRIDGE TOOLING REF693207","10503.31","LEDGERBENCH DEMO LTD","73-78-85 27346923","acct-2026350004-3"
"25/11/2025","TFR","TFR EASTFIELD ENERGY REF658333","4190.82","LEDGERBENCH DEMO LTD","73-78-85 27346923","acct-2026350004-3"
"26/11/2025","TFR","TFR LARKSPUR TRAVEL REF375349","9481.01","LEDGERBENCH DEMO LTD","73-78-85 27346923","acct-2026350004-3"
"27/11/2025","DD","DD AURORA CONSULTING LTD REF798130","-8380.71","LEDGERBENCH DEMO LTD","73-78-85 27346923","acct-2026350004-3"
"29/11/2025","DD","DD NORTHGATE CLEANING REF116098","-7876.12","LEDGERBENCH DEMO LTD","73-78-85 27346923","acct-2026350004-3"
"29/11/2025","CR","CR DELPHINIUM MEDIA REF729941","2678.47","LEDGERBENCH DEMO LTD","73-78-85 27346923","acct-2026350004-3"
"29/11/2025","CR","CR DELPHINIUM MEDIA REF729942","2678.47","LEDGERBENCH DEMO LTD","73-78-85 27346923","acct-2026350004-3"
"29/11/2025","FPI","FPI HARBOURLIGHT IT REF638859","10503.99","LEDGERBENCH DEMO LTD","73-78-85 27346923","acct-2026350004-3"
"30/11/2025","BP","BP BRAMBLE LOGISTICS REF104411","-2648.59","LEDGERBENCH DEMO LTD","73-78-85 27346923","acct-2026350004-3"
 

Ground truth

Public here because the benchmark is open; it is the model's prompt path that can never reach these values, not human readers.

AccountClosing balance
acct-2026350004-1£17,809.56
acct-2026350004-2£210,968.69
acct-2026350004-3£121,983.66

Recorded runs on this case

  • wrongSingle prompt2 steps · 9,988 tokens · Confidence high

    Model claude-sonnet-4-6Measured 2026-08-20Bench v1.0Run 11eaa71b2d02Commit 3d38c30

  • wrongAgent with tools17 steps · 27,695 tokens · Confidence high

    Model claude-sonnet-4-6Measured 2026-08-20Bench v1.0Run f140aa1e57f4Commit 384d72d

Step through any of these on the demo page.