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near_duplicate

near_duplicate-2026350002

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-2026350002-2-2025-03-31</MsgId>
<CreDtTm>2025-03-31T23:59:00+00:00</CreDtTm>
</GrpHdr>
<Stmt>
<Id>acct-2026350002-2</Id>
<ElctrncSeqNb>1</ElctrncSeqNb>
<CreDtTm>2025-03-31T23:59:00+00:00</CreDtTm>
<FrToDt>
<FrDtTm>2025-03-01T00:00:00+00:00</FrDtTm>
<ToDtTm>2025-03-31T23:59:59+00:00</ToDtTm>
</FrToDt>
<Acct>
<Id>
<IBAN>GB68LBEN30491390573189</IBAN>
</Id>
<Ccy>GBP</Ccy>
</Acct>
<Bal>
<Tp>
<CdOrPrtry>
<Cd>OPBD</Cd>
</CdOrPrtry>
</Tp>
<Amt Ccy="GBP">55438.60</Amt>
<CdtDbtInd>CRDT</CdtDbtInd>
<Dt>
<Dt>2025-03-01</Dt>
</Dt>
</Bal>
<Ntry>
<Amt Ccy="GBP">11851.59</Amt>
<CdtDbtInd>CRDT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-03-02</Dt>
</BookgDt>
<ValDt>
<Dt>2025-03-02</Dt>
</ValDt>
<AcctSvcrRef>acct-2026350002-2-t011</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>TFR NORTHGATE CLEANING REF581739</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">10251.46</Amt>
<CdtDbtInd>CRDT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-03-02</Dt>
</BookgDt>
<ValDt>
<Dt>2025-03-02</Dt>
</ValDt>
<AcctSvcrRef>acct-2026350002-2-t018</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>FPI BRAMBLE LOGISTICS REF604248</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">5505.67</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-03-04</Dt>
</BookgDt>
<ValDt>
<Dt>2025-03-04</Dt>
</ValDt>
<AcctSvcrRef>acct-2026350002-2-t003</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>SO MOORLAND TELECOM REF725737</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">7586.02</Amt>
<CdtDbtInd>CRDT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-03-07</Dt>
</BookgDt>
<ValDt>
<Dt>2025-03-07</Dt>
</ValDt>
<AcctSvcrRef>acct-2026350002-2-t008</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>CR CASTLEGATE PROPERTY REF331621</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">4126.91</Amt>
<CdtDbtInd>CRDT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-03-08</Dt>
</BookgDt>
<ValDt>
<Dt>2025-03-08</Dt>
</ValDt>
<AcctSvcrRef>acct-2026350002-2-t017</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>TFR JUNIPER PAYROLL REF377821</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">5674.67</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-03-08</Dt>
</BookgDt>
<ValDt>
<Dt>2025-03-08</Dt>
</ValDt>
<AcctSvcrRef>acct-2026350002-2-t023</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>SO MOORLAND TELECOM REF794141</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">768.86</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-03-10</Dt>
</BookgDt>
<ValDt>
<Dt>2025-03-10</Dt>
</ValDt>
<AcctSvcrRef>acct-2026350002-2-t001</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>BP LARKSPUR TRAVEL REF299537</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">12926.59</Amt>
<CdtDbtInd>CRDT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-03-10</Dt>
</BookgDt>
<ValDt>
<Dt>2025-03-10</Dt>
</ValDt>
<AcctSvcrRef>acct-2026350002-2-t012</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>CR KESTREL INSURANCE REF749481</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">14217.16</Amt>
<CdtDbtInd>CRDT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-03-12</Dt>
</BookgDt>
<ValDt>
<Dt>2025-03-12</Dt>
</ValDt>
<AcctSvcrRef>acct-2026350002-2-t015</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>FPI KESTREL INSURANCE REF805517</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">3131.99</Amt>
<CdtDbtInd>CRDT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-03-14</Dt>
</BookgDt>
<ValDt>
<Dt>2025-03-14</Dt>
</ValDt>
<AcctSvcrRef>acct-2026350002-2-t006</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>FPI NORTHGATE CLEANING REF845844</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">8380.49</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-03-15</Dt>
</BookgDt>
<ValDt>
<Dt>2025-03-15</Dt>
</ValDt>
<AcctSvcrRef>acct-2026350002-2-t002</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>FPO DELPHINIUM MEDIA REF239617</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">11333.93</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-03-15</Dt>
</BookgDt>
<ValDt>
<Dt>2025-03-15</Dt>
</ValDt>
<AcctSvcrRef>acct-2026350002-2-t010</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>FPO OSPREY LEASING REF780343</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">7107.32</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-03-15</Dt>
</BookgDt>
<ValDt>
<Dt>2025-03-15</Dt>
</ValDt>
<AcctSvcrRef>acct-2026350002-2-t021</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>DD OSPREY LEASING REF767188</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">1990.29</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-03-16</Dt>
</BookgDt>
<ValDt>
<Dt>2025-03-16</Dt>
</ValDt>
<AcctSvcrRef>acct-2026350002-2-t004</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>DD CASTLEGATE PROPERTY REF130836</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">1473.49</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-03-16</Dt>
</BookgDt>
<ValDt>
<Dt>2025-03-16</Dt>
</ValDt>
<AcctSvcrRef>acct-2026350002-2-t013</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>FPO FENWICK &amp; PARTNERS REF493238</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">9670.80</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-03-19</Dt>
</BookgDt>
<ValDt>
<Dt>2025-03-19</Dt>
</ValDt>
<AcctSvcrRef>acct-2026350002-2-t016</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>DD LARKSPUR TRAVEL REF316684</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">6615.59</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-03-19</Dt>
</BookgDt>
<ValDt>
<Dt>2025-03-19</Dt>
</ValDt>
<AcctSvcrRef>acct-2026350002-2-t019</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>BP JUNIPER PAYROLL REF743495</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">4460.60</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-03-20</Dt>
</BookgDt>
<ValDt>
<Dt>2025-03-20</Dt>
</ValDt>
<AcctSvcrRef>acct-2026350002-2-t014</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>DD AURORA CONSULTING LTD REF324198</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">2144.14</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-03-20</Dt>
</BookgDt>
<ValDt>
<Dt>2025-03-20</Dt>
</ValDt>
<AcctSvcrRef>acct-2026350002-2-t020</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>DD HARBOURLIGHT IT REF684845</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">10110.29</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-03-22</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: 47-38-56 65888084
Account reference: acct-2026350002-1
Statement period: 01 Mar 2025 to 31 Mar 2025
Currency: GBP
Opening balance: 179181.07
Date Payment type Details Paid out Paid in
01 Mar 2025 FPI OSPREY LEASING REF915566 6259.46
02 Mar 2025 FPO EASTFIELD ENERGY REF944886 12498.79
03 Mar 2025 BP CASTLEGATE PROPERTY REF438151 13125.70
05 Mar 2025 TFR HARBOURLIGHT IT REF780086 5894.02
06 Mar 2025 TFR BRAMBLE LOGISTICS REF204469 13484.27
06 Mar 2025 TFR DELPHINIUM MEDIA REF731607 10871.65
08 Mar 2025 BP IRONBRIDGE TOOLING REF384567 12686.76
08 Mar 2025 CR MOORLAND TELECOM REF955745 2685.91
08 Mar 2025 BP NORTHGATE CLEANING REF175414 14494.66
10 Mar 2025 FPO HARBOURLIGHT IT REF479674 7542.60
11 Mar 2025 DD BRAMBLE LOGISTICS REF498188 11763.17
13 Mar 2025 SO DELPHINIUM MEDIA REF509347 12580.95
14 Mar 2025 CR LARKSPUR TRAVEL REF460039 5701.14
14 Mar 2025 CR DELPHINIUM MEDIA REF146510 12831.32
16 Mar 2025 CR OSPREY LEASING REF282954 12691.78
18 Mar 2025 CR KESTREL INSURANCE REF837018 769.77
19 Mar 2025 FPI FENWICK & PARTNERS REF551198 8691.31
20 Mar 2025 DD HARBOURLIGHT IT REF888195 3171.13
21 Mar 2025 FPI IRONBRIDGE TOOLING REF551344 11017.50
22 Mar 2025 SO NORTHGATE CLEANING REF820456 12972.35
22 Mar 2025 TFR MOORLAND TELECOM REF198020 11474.76
27 Mar 2025 FPO LARKSPUR TRAVEL REF128901 4458.72
28 Mar 2025 SO MOORLAND TELECOM REF916536 8870.35
28 Mar 2025 DD FENWICK & PARTNERS REF715969 717.18
29 Mar 2025 FPO EASTFIELD ENERGY REF309031 12907.98
rbs_transactions.csv1 changed line · first at line 25
"Date","Type","Description","Value","Account Name","Account Number","Ledger Ref"
"01/03/2025","BAL","OPENING BALANCE","148149.95","LEDGERBENCH DEMO LTD","50-87-80 78717020","acct-2026350002-3"
"01/03/2025","FPI","FPI FENWICK & PARTNERS REF868645","11946.39","LEDGERBENCH DEMO LTD","50-87-80 78717020","acct-2026350002-3"
"02/03/2025","CR","CR JUNIPER PAYROLL REF134702","1911.69","LEDGERBENCH DEMO LTD","50-87-80 78717020","acct-2026350002-3"
"03/03/2025","BP","BP JUNIPER PAYROLL REF530743","-4203.56","LEDGERBENCH DEMO LTD","50-87-80 78717020","acct-2026350002-3"
"03/03/2025","FPO","FPO AURORA CONSULTING LTD REF724552","-4010.04","LEDGERBENCH DEMO LTD","50-87-80 78717020","acct-2026350002-3"
"05/03/2025","TFR","TFR HARBOURLIGHT IT REF886040","1067.09","LEDGERBENCH DEMO LTD","50-87-80 78717020","acct-2026350002-3"
"06/03/2025","TFR","TFR BRAMBLE LOGISTICS REF130169","7691.77","LEDGERBENCH DEMO LTD","50-87-80 78717020","acct-2026350002-3"
"07/03/2025","BP","BP DELPHINIUM MEDIA REF239843","-12936.13","LEDGERBENCH DEMO LTD","50-87-80 78717020","acct-2026350002-3"
"08/03/2025","CR","CR EASTFIELD ENERGY REF462891","1236.95","LEDGERBENCH DEMO LTD","50-87-80 78717020","acct-2026350002-3"
"09/03/2025","CR","CR AURORA CONSULTING LTD REF173812","4520.39","LEDGERBENCH DEMO LTD","50-87-80 78717020","acct-2026350002-3"
"09/03/2025","FPO","FPO OSPREY LEASING REF532962","-9813.24","LEDGERBENCH DEMO LTD","50-87-80 78717020","acct-2026350002-3"
"09/03/2025","CR","CR FENWICK & PARTNERS REF580166","12540.47","LEDGERBENCH DEMO LTD","50-87-80 78717020","acct-2026350002-3"
"10/03/2025","FPO","FPO BRAMBLE LOGISTICS REF406556","-9252.79","LEDGERBENCH DEMO LTD","50-87-80 78717020","acct-2026350002-3"
"11/03/2025","CR","CR GREENHOLM FOODS REF609037","10390.36","LEDGERBENCH DEMO LTD","50-87-80 78717020","acct-2026350002-3"
"13/03/2025","FPO","FPO FENWICK & PARTNERS REF396018","-4761.38","LEDGERBENCH DEMO LTD","50-87-80 78717020","acct-2026350002-3"
"14/03/2025","DD","DD CASTLEGATE PROPERTY REF265211","-4995.13","LEDGERBENCH DEMO LTD","50-87-80 78717020","acct-2026350002-3"
"17/03/2025","CR","CR FENWICK & PARTNERS REF959776","543.32","LEDGERBENCH DEMO LTD","50-87-80 78717020","acct-2026350002-3"
"21/03/2025","FPI","FPI GREENHOLM FOODS REF213859","13067.36","LEDGERBENCH DEMO LTD","50-87-80 78717020","acct-2026350002-3"
"21/03/2025","FPO","FPO GREENHOLM FOODS REF236096","-9938.15","LEDGERBENCH DEMO LTD","50-87-80 78717020","acct-2026350002-3"
"25/03/2025","CR","CR LARKSPUR TRAVEL REF442218","7587.93","LEDGERBENCH DEMO LTD","50-87-80 78717020","acct-2026350002-3"
"25/03/2025","FPO","FPO DELPHINIUM MEDIA REF586260","-4010.38","LEDGERBENCH DEMO LTD","50-87-80 78717020","acct-2026350002-3"
"26/03/2025","TFR","TFR HARBOURLIGHT IT REF423399","3240.78","LEDGERBENCH DEMO LTD","50-87-80 78717020","acct-2026350002-3"
"29/03/2025","FPO","FPO OSPREY LEASING REF106898","-2277.83","LEDGERBENCH DEMO LTD","50-87-80 78717020","acct-2026350002-3"
"29/03/2025","FPO","FPO OSPREY LEASING REF106899","-2277.83","LEDGERBENCH DEMO LTD","50-87-80 78717020","acct-2026350002-3"
"29/03/2025","DD","DD LARKSPUR TRAVEL REF761962","-7223.15","LEDGERBENCH DEMO LTD","50-87-80 78717020","acct-2026350002-3"
"31/03/2025","FPI","FPI BRAMBLE LOGISTICS REF314816","4336.92","LEDGERBENCH DEMO LTD","50-87-80 78717020","acct-2026350002-3"
 

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-2026350002-1£153,763.62
acct-2026350002-2£43,123.84
acct-2026350002-3£154,809.59

Recorded runs on this case

  • wrongSingle prompt2 steps · 10,337 tokens · Confidence high

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

  • wrongAgent with tools17 steps · 29,025 tokens · Confidence high

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

Step through any of these on the demo page.