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near_duplicate

near_duplicate-2026350003

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-2026350003-2-2025-01-31</MsgId>
<CreDtTm>2025-01-31T23:59:00+00:00</CreDtTm>
</GrpHdr>
<Stmt>
<Id>acct-2026350003-2</Id>
<ElctrncSeqNb>1</ElctrncSeqNb>
<CreDtTm>2025-01-31T23:59:00+00:00</CreDtTm>
<FrToDt>
<FrDtTm>2025-01-01T00:00:00+00:00</FrDtTm>
<ToDtTm>2025-01-31T23:59:59+00:00</ToDtTm>
</FrToDt>
<Acct>
<Id>
<IBAN>GB79LBEN81257637135800</IBAN>
</Id>
<Ccy>GBP</Ccy>
</Acct>
<Bal>
<Tp>
<CdOrPrtry>
<Cd>OPBD</Cd>
</CdOrPrtry>
</Tp>
<Amt Ccy="GBP">24475.49</Amt>
<CdtDbtInd>CRDT</CdtDbtInd>
<Dt>
<Dt>2025-01-01</Dt>
</Dt>
</Bal>
<Ntry>
<Amt Ccy="GBP">12583.14</Amt>
<CdtDbtInd>CRDT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-01-02</Dt>
</BookgDt>
<ValDt>
<Dt>2025-01-02</Dt>
</ValDt>
<AcctSvcrRef>acct-2026350003-2-t018</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>CR AURORA CONSULTING LTD REF722311</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">11790.09</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-01-03</Dt>
</BookgDt>
<ValDt>
<Dt>2025-01-03</Dt>
</ValDt>
<AcctSvcrRef>acct-2026350003-2-t009</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>BP BRAMBLE LOGISTICS REF477810</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">14313.70</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-01-05</Dt>
</BookgDt>
<ValDt>
<Dt>2025-01-05</Dt>
</ValDt>
<AcctSvcrRef>acct-2026350003-2-t005</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>BP KESTREL INSURANCE REF375424</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">10729.45</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-01-05</Dt>
</BookgDt>
<ValDt>
<Dt>2025-01-05</Dt>
</ValDt>
<AcctSvcrRef>acct-2026350003-2-t006</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>FPO EASTFIELD ENERGY REF928155</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">12393.07</Amt>
<CdtDbtInd>CRDT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-01-07</Dt>
</BookgDt>
<ValDt>
<Dt>2025-01-07</Dt>
</ValDt>
<AcctSvcrRef>acct-2026350003-2-t001</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>TFR HARBOURLIGHT IT REF488800</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">208.93</Amt>
<CdtDbtInd>CRDT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-01-08</Dt>
</BookgDt>
<ValDt>
<Dt>2025-01-08</Dt>
</ValDt>
<AcctSvcrRef>acct-2026350003-2-t016</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>TFR MOORLAND TELECOM REF473098</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">11018.75</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-01-12</Dt>
</BookgDt>
<ValDt>
<Dt>2025-01-12</Dt>
</ValDt>
<AcctSvcrRef>acct-2026350003-2-t002</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>BP EASTFIELD ENERGY REF137291</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">10479.29</Amt>
<CdtDbtInd>CRDT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-01-12</Dt>
</BookgDt>
<ValDt>
<Dt>2025-01-12</Dt>
</ValDt>
<AcctSvcrRef>acct-2026350003-2-t015</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>FPI JUNIPER PAYROLL REF278023</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">12379.53</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-01-16</Dt>
</BookgDt>
<ValDt>
<Dt>2025-01-16</Dt>
</ValDt>
<AcctSvcrRef>acct-2026350003-2-t007</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>SO AURORA CONSULTING LTD REF723070</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">6014.27</Amt>
<CdtDbtInd>CRDT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-01-17</Dt>
</BookgDt>
<ValDt>
<Dt>2025-01-17</Dt>
</ValDt>
<AcctSvcrRef>acct-2026350003-2-t022</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>TFR JUNIPER PAYROLL REF749646</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">6245.87</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-01-18</Dt>
</BookgDt>
<ValDt>
<Dt>2025-01-18</Dt>
</ValDt>
<AcctSvcrRef>acct-2026350003-2-t003</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>SO FENWICK &amp; PARTNERS REF797002</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">10615.45</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-01-18</Dt>
</BookgDt>
<ValDt>
<Dt>2025-01-18</Dt>
</ValDt>
<AcctSvcrRef>acct-2026350003-2-t012</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>BP HARBOURLIGHT IT REF612587</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">147.15</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-01-20</Dt>
</BookgDt>
<ValDt>
<Dt>2025-01-20</Dt>
</ValDt>
<AcctSvcrRef>acct-2026350003-2-t010</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>BP JUNIPER PAYROLL REF776042</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">11169.14</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-01-21</Dt>
</BookgDt>
<ValDt>
<Dt>2025-01-21</Dt>
</ValDt>
<AcctSvcrRef>acct-2026350003-2-t023</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>FPO HARBOURLIGHT IT REF971475</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">1376.01</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-01-21</Dt>
</BookgDt>
<ValDt>
<Dt>2025-01-21</Dt>
</ValDt>
<AcctSvcrRef>acct-2026350003-2-t025</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>SO JUNIPER PAYROLL REF545519</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">7039.05</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-01-23</Dt>
</BookgDt>
<ValDt>
<Dt>2025-01-23</Dt>
</ValDt>
<AcctSvcrRef>acct-2026350003-2-t011</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>DD MOORLAND TELECOM REF668119</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">4050.89</Amt>
<CdtDbtInd>CRDT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-01-23</Dt>
</BookgDt>
<ValDt>
<Dt>2025-01-23</Dt>
</ValDt>
<AcctSvcrRef>acct-2026350003-2-t014</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>FPI IRONBRIDGE TOOLING REF144291</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">10259.39</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-01-24</Dt>
</BookgDt>
<ValDt>
<Dt>2025-01-24</Dt>
</ValDt>
<AcctSvcrRef>acct-2026350003-2-t008</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>SO OSPREY LEASING REF355527</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">13322.43</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-01-24</Dt>
</BookgDt>
<ValDt>
<Dt>2025-01-24</Dt>
</ValDt>
<AcctSvcrRef>acct-2026350003-2-t017</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>FPO MOORLAND TELECOM REF815747</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">336.74</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-01-25</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: 50-20-37 59973033
Account reference: acct-2026350003-1
Statement period: 01 Jan 2025 to 31 Jan 2025
Currency: GBP
Opening balance: 115485.55
Date Payment type Details Paid out Paid in
01 Jan 2025 CR HARBOURLIGHT IT REF342859 8151.63
05 Jan 2025 TFR MOORLAND TELECOM REF377743 12685.76
06 Jan 2025 FPO JUNIPER PAYROLL REF611169 901.47
07 Jan 2025 BP DELPHINIUM MEDIA REF918723 9338.35
08 Jan 2025 FPI EASTFIELD ENERGY REF585357 4217.67
08 Jan 2025 TFR BRAMBLE LOGISTICS REF317431 2194.91
08 Jan 2025 FPO FENWICK & PARTNERS REF260674 3015.61
09 Jan 2025 FPI EASTFIELD ENERGY REF377830 10056.35
10 Jan 2025 CR CASTLEGATE PROPERTY REF629081 7022.92
10 Jan 2025 TFR BRAMBLE LOGISTICS REF352561 1716.96
12 Jan 2025 SO NORTHGATE CLEANING REF420031 11155.80
16 Jan 2025 TFR DELPHINIUM MEDIA REF875486 14656.12
17 Jan 2025 BP DELPHINIUM MEDIA REF865836 8725.12
18 Jan 2025 SO KESTREL INSURANCE REF932923 4962.26
19 Jan 2025 FPI IRONBRIDGE TOOLING REF942974 81.51
21 Jan 2025 CR DELPHINIUM MEDIA REF634517 11591.97
21 Jan 2025 FPO LARKSPUR TRAVEL REF733122 9859.43
23 Jan 2025 CR LARKSPUR TRAVEL REF890809 13103.46
25 Jan 2025 TFR BRAMBLE LOGISTICS REF255471 14718.19
25 Jan 2025 FPO CASTLEGATE PROPERTY REF952691 10873.85
27 Jan 2025 FPI OSPREY LEASING REF402296 5261.36
27 Jan 2025 FPO JUNIPER PAYROLL REF430267 14559.72
29 Jan 2025 SO KESTREL INSURANCE REF724328 14774.14
29 Jan 2025 FPI GREENHOLM FOODS REF606840 11258.28
31 Jan 2025 FPO DELPHINIUM MEDIA REF447330 13490.30
31 Jan 2025 SO IRONBRIDGE TOOLING REF702711 9065.22
rbs_transactions.csv1 changed line · first at line 24
"Date","Type","Description","Value","Account Name","Account Number","Ledger Ref"
"01/01/2025","BAL","OPENING BALANCE","131987.70","LEDGERBENCH DEMO LTD","60-25-43 27879464","acct-2026350003-3"
"02/01/2025","FPI","FPI DELPHINIUM MEDIA REF158438","10623.42","LEDGERBENCH DEMO LTD","60-25-43 27879464","acct-2026350003-3"
"03/01/2025","FPO","FPO IRONBRIDGE TOOLING REF711366","-8510.85","LEDGERBENCH DEMO LTD","60-25-43 27879464","acct-2026350003-3"
"04/01/2025","DD","DD MOORLAND TELECOM REF276026","-8394.58","LEDGERBENCH DEMO LTD","60-25-43 27879464","acct-2026350003-3"
"05/01/2025","DD","DD NORTHGATE CLEANING REF187175","-4129.39","LEDGERBENCH DEMO LTD","60-25-43 27879464","acct-2026350003-3"
"06/01/2025","SO","SO BRAMBLE LOGISTICS REF211713","-13654.17","LEDGERBENCH DEMO LTD","60-25-43 27879464","acct-2026350003-3"
"06/01/2025","FPI","FPI BRAMBLE LOGISTICS REF419952","7574.46","LEDGERBENCH DEMO LTD","60-25-43 27879464","acct-2026350003-3"
"07/01/2025","TFR","TFR MOORLAND TELECOM REF908375","4447.38","LEDGERBENCH DEMO LTD","60-25-43 27879464","acct-2026350003-3"
"07/01/2025","FPI","FPI KESTREL INSURANCE REF348002","9226.85","LEDGERBENCH DEMO LTD","60-25-43 27879464","acct-2026350003-3"
"08/01/2025","BP","BP FENWICK & PARTNERS REF266938","-10733.73","LEDGERBENCH DEMO LTD","60-25-43 27879464","acct-2026350003-3"
"10/01/2025","FPI","FPI CASTLEGATE PROPERTY REF262299","14546.69","LEDGERBENCH DEMO LTD","60-25-43 27879464","acct-2026350003-3"
"10/01/2025","DD","DD JUNIPER PAYROLL REF169557","-13472.74","LEDGERBENCH DEMO LTD","60-25-43 27879464","acct-2026350003-3"
"10/01/2025","BP","BP NORTHGATE CLEANING REF770438","-14079.93","LEDGERBENCH DEMO LTD","60-25-43 27879464","acct-2026350003-3"
"14/01/2025","BP","BP BRAMBLE LOGISTICS REF198590","-1789.93","LEDGERBENCH DEMO LTD","60-25-43 27879464","acct-2026350003-3"
"15/01/2025","DD","DD FENWICK & PARTNERS REF563643","-528.02","LEDGERBENCH DEMO LTD","60-25-43 27879464","acct-2026350003-3"
"16/01/2025","TFR","TFR CASTLEGATE PROPERTY REF779799","10457.77","LEDGERBENCH DEMO LTD","60-25-43 27879464","acct-2026350003-3"
"16/01/2025","BP","BP NORTHGATE CLEANING REF856153","-5295.83","LEDGERBENCH DEMO LTD","60-25-43 27879464","acct-2026350003-3"
"19/01/2025","CR","CR JUNIPER PAYROLL REF450402","5854.66","LEDGERBENCH DEMO LTD","60-25-43 27879464","acct-2026350003-3"
"20/01/2025","SO","SO AURORA CONSULTING LTD REF655782","-1514.11","LEDGERBENCH DEMO LTD","60-25-43 27879464","acct-2026350003-3"
"21/01/2025","FPO","FPO BRAMBLE LOGISTICS REF472290","-1547.16","LEDGERBENCH DEMO LTD","60-25-43 27879464","acct-2026350003-3"
"22/01/2025","FPI","FPI EASTFIELD ENERGY REF116502","9465.70","LEDGERBENCH DEMO LTD","60-25-43 27879464","acct-2026350003-3"
"24/01/2025","TFR","TFR FENWICK & PARTNERS REF328105","7566.10","LEDGERBENCH DEMO LTD","60-25-43 27879464","acct-2026350003-3"
"24/01/2025","TFR","TFR FENWICK & PARTNERS REF328106","7566.10","LEDGERBENCH DEMO LTD","60-25-43 27879464","acct-2026350003-3"
"25/01/2025","FPO","FPO DELPHINIUM MEDIA REF224093","-5870.68","LEDGERBENCH DEMO LTD","60-25-43 27879464","acct-2026350003-3"
"27/01/2025","BP","BP NORTHGATE CLEANING REF454734","-352.66","LEDGERBENCH DEMO LTD","60-25-43 27879464","acct-2026350003-3"
"27/01/2025","FPO","FPO EASTFIELD ENERGY REF229215","-10709.33","LEDGERBENCH DEMO LTD","60-25-43 27879464","acct-2026350003-3"
"28/01/2025","BP","BP LARKSPUR TRAVEL REF281505","-8001.95","LEDGERBENCH DEMO LTD","60-25-43 27879464","acct-2026350003-3"
"28/01/2025","BP","BP KESTREL INSURANCE REF603112","-6611.43","LEDGERBENCH DEMO LTD","60-25-43 27879464","acct-2026350003-3"
"28/01/2025","FPO","FPO JUNIPER PAYROLL REF618224","-4055.20","LEDGERBENCH DEMO LTD","60-25-43 27879464","acct-2026350003-3"
"29/01/2025","CR","CR GREENHOLM FOODS REF687250","14054.71","LEDGERBENCH DEMO LTD","60-25-43 27879464","acct-2026350003-3"
"31/01/2025","CR","CR GREENHOLM FOODS REF760859","791.66","LEDGERBENCH DEMO LTD","60-25-43 27879464","acct-2026350003-3"
 

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-2026350003-1£121,481.37
acct-2026350003-2−£55,996.44
acct-2026350003-3£107,345.41

Recorded runs on this case

  • wrongSingle prompt2 steps · 12,099 tokens · Confidence medium

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

  • wrongAgent with tools17 steps · 30,545 tokens · Confidence high

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

Step through any of these on the demo page.