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near_duplicate

near_duplicate-2026350001

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-2026350001-2-2025-09-30</MsgId>
<CreDtTm>2025-09-30T23:59:00+00:00</CreDtTm>
</GrpHdr>
<Stmt>
<Id>acct-2026350001-2</Id>
<ElctrncSeqNb>1</ElctrncSeqNb>
<CreDtTm>2025-09-30T23:59:00+00:00</CreDtTm>
<FrToDt>
<FrDtTm>2025-09-01T00:00:00+00:00</FrDtTm>
<ToDtTm>2025-09-30T23:59:59+00:00</ToDtTm>
</FrToDt>
<Acct>
<Id>
<IBAN>GB36LBEN36714636414900</IBAN>
</Id>
<Ccy>GBP</Ccy>
</Acct>
<Bal>
<Tp>
<CdOrPrtry>
<Cd>OPBD</Cd>
</CdOrPrtry>
</Tp>
<Amt Ccy="GBP">21837.81</Amt>
<CdtDbtInd>CRDT</CdtDbtInd>
<Dt>
<Dt>2025-09-01</Dt>
</Dt>
</Bal>
<Ntry>
<Amt Ccy="GBP">8113.66</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-09-02</Dt>
</BookgDt>
<ValDt>
<Dt>2025-09-02</Dt>
</ValDt>
<AcctSvcrRef>acct-2026350001-2-t012</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>BP KESTREL INSURANCE REF231936</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">10301.64</Amt>
<CdtDbtInd>CRDT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-09-07</Dt>
</BookgDt>
<ValDt>
<Dt>2025-09-07</Dt>
</ValDt>
<AcctSvcrRef>acct-2026350001-2-t005</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>FPI AURORA CONSULTING LTD REF804194</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">11963.74</Amt>
<CdtDbtInd>CRDT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-09-09</Dt>
</BookgDt>
<ValDt>
<Dt>2025-09-09</Dt>
</ValDt>
<AcctSvcrRef>acct-2026350001-2-t017</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>TFR OSPREY LEASING REF101226</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">6800.15</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-09-10</Dt>
</BookgDt>
<ValDt>
<Dt>2025-09-10</Dt>
</ValDt>
<AcctSvcrRef>acct-2026350001-2-t010</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>FPO DELPHINIUM MEDIA REF693204</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">13757.19</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-09-11</Dt>
</BookgDt>
<ValDt>
<Dt>2025-09-11</Dt>
</ValDt>
<AcctSvcrRef>acct-2026350001-2-t007</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>BP NORTHGATE CLEANING REF500551</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">3303.47</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-09-11</Dt>
</BookgDt>
<ValDt>
<Dt>2025-09-11</Dt>
</ValDt>
<AcctSvcrRef>acct-2026350001-2-t019</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>FPO AURORA CONSULTING LTD REF845759</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">12501.78</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-09-11</Dt>
</BookgDt>
<ValDt>
<Dt>2025-09-11</Dt>
</ValDt>
<AcctSvcrRef>acct-2026350001-2-t022</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>FPO GREENHOLM FOODS REF194598</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">13606.02</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-09-12</Dt>
</BookgDt>
<ValDt>
<Dt>2025-09-12</Dt>
</ValDt>
<AcctSvcrRef>acct-2026350001-2-t004</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>FPO AURORA CONSULTING LTD REF690349</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">14392.05</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-09-12</Dt>
</BookgDt>
<ValDt>
<Dt>2025-09-12</Dt>
</ValDt>
<AcctSvcrRef>acct-2026350001-2-t015</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>FPO BRAMBLE LOGISTICS REF956940</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">7059.07</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-09-13</Dt>
</BookgDt>
<ValDt>
<Dt>2025-09-13</Dt>
</ValDt>
<AcctSvcrRef>acct-2026350001-2-t008</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>FPO GREENHOLM FOODS REF545003</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">10111.03</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-09-13</Dt>
</BookgDt>
<ValDt>
<Dt>2025-09-13</Dt>
</ValDt>
<AcctSvcrRef>acct-2026350001-2-t009</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>BP EASTFIELD ENERGY REF994486</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">3027.41</Amt>
<CdtDbtInd>CRDT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-09-14</Dt>
</BookgDt>
<ValDt>
<Dt>2025-09-14</Dt>
</ValDt>
<AcctSvcrRef>acct-2026350001-2-t006</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>TFR OSPREY LEASING REF123201</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">797.99</Amt>
<CdtDbtInd>CRDT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-09-14</Dt>
</BookgDt>
<ValDt>
<Dt>2025-09-14</Dt>
</ValDt>
<AcctSvcrRef>acct-2026350001-2-t011</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>TFR OSPREY LEASING REF283708</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">7049.06</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-09-14</Dt>
</BookgDt>
<ValDt>
<Dt>2025-09-14</Dt>
</ValDt>
<AcctSvcrRef>acct-2026350001-2-t014</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>DD CASTLEGATE PROPERTY REF822542</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">1779.14</Amt>
<CdtDbtInd>CRDT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-09-16</Dt>
</BookgDt>
<ValDt>
<Dt>2025-09-16</Dt>
</ValDt>
<AcctSvcrRef>acct-2026350001-2-t020</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>TFR HARBOURLIGHT IT REF794693</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">7127.97</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-09-21</Dt>
</BookgDt>
<ValDt>
<Dt>2025-09-21</Dt>
</ValDt>
<AcctSvcrRef>acct-2026350001-2-t001</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>BP LARKSPUR TRAVEL REF441944</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">14698.68</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-09-21</Dt>
</BookgDt>
<ValDt>
<Dt>2025-09-21</Dt>
</ValDt>
<AcctSvcrRef>acct-2026350001-2-t002</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>BP BRAMBLE LOGISTICS REF457372</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">12317.06</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-09-23</Dt>
</BookgDt>
<ValDt>
<Dt>2025-09-23</Dt>
</ValDt>
<AcctSvcrRef>acct-2026350001-2-t003</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>DD HARBOURLIGHT IT REF216144</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">3598.38</Amt>
<CdtDbtInd>CRDT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-09-29</Dt>
</BookgDt>
<ValDt>
<Dt>2025-09-29</Dt>
</ValDt>
<AcctSvcrRef>acct-2026350001-2-t013</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>TFR EASTFIELD ENERGY REF407570</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">3732.74</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-09-29</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: 54-75-66 12732835
Account reference: acct-2026350001-1
Statement period: 01 Sep 2025 to 30 Sep 2025
Currency: GBP
Opening balance: 137245.17
Date Payment type Details Paid out Paid in
04 Sep 2025 FPO BRAMBLE LOGISTICS REF655950 7392.48
08 Sep 2025 CR AURORA CONSULTING LTD REF152264 5018.22
08 Sep 2025 CR AURORA CONSULTING LTD REF569553 1121.38
09 Sep 2025 FPO CASTLEGATE PROPERTY REF576866 9968.47
10 Sep 2025 SO JUNIPER PAYROLL REF478163 12016.08
10 Sep 2025 TFR GREENHOLM FOODS REF871804 4911.43
11 Sep 2025 TFR NORTHGATE CLEANING REF319102 9886.92
12 Sep 2025 FPO LARKSPUR TRAVEL REF624182 11768.97
12 Sep 2025 CR LARKSPUR TRAVEL REF614526 7476.24
14 Sep 2025 CR FENWICK & PARTNERS REF882232 14861.20
15 Sep 2025 BP NORTHGATE CLEANING REF754964 2502.31
16 Sep 2025 SO OSPREY LEASING REF688364 476.74
17 Sep 2025 TFR IRONBRIDGE TOOLING REF398819 6763.45
19 Sep 2025 DD IRONBRIDGE TOOLING REF564590 4989.93
19 Sep 2025 BP KESTREL INSURANCE REF585938 1048.21
19 Sep 2025 FPI KESTREL INSURANCE REF292210 5683.57
22 Sep 2025 CR MOORLAND TELECOM REF147624 9464.46
22 Sep 2025 SO FENWICK & PARTNERS REF548687 988.82
23 Sep 2025 DD MOORLAND TELECOM REF691881 3707.34
23 Sep 2025 DD EASTFIELD ENERGY REF519938 9735.62
27 Sep 2025 BP LARKSPUR TRAVEL REF765688 683.09
28 Sep 2025 BP AURORA CONSULTING LTD REF113900 13305.00
28 Sep 2025 FPI AURORA CONSULTING LTD REF214742 10770.67
30 Sep 2025 TFR IRONBRIDGE TOOLING REF733594 11796.64
rbs_transactions.csv1 changed line · first at line 25
"Date","Type","Description","Value","Account Name","Account Number","Ledger Ref"
"01/09/2025","BAL","OPENING BALANCE","125290.07","LEDGERBENCH DEMO LTD","21-28-78 52114031","acct-2026350001-3"
"02/09/2025","DD","DD NORTHGATE CLEANING REF663694","-9916.67","LEDGERBENCH DEMO LTD","21-28-78 52114031","acct-2026350001-3"
"04/09/2025","TFR","TFR JUNIPER PAYROLL REF452969","12578.60","LEDGERBENCH DEMO LTD","21-28-78 52114031","acct-2026350001-3"
"05/09/2025","TFR","TFR FENWICK & PARTNERS REF201772","67.74","LEDGERBENCH DEMO LTD","21-28-78 52114031","acct-2026350001-3"
"05/09/2025","FPO","FPO GREENHOLM FOODS REF694930","-595.43","LEDGERBENCH DEMO LTD","21-28-78 52114031","acct-2026350001-3"
"07/09/2025","FPI","FPI BRAMBLE LOGISTICS REF120112","537.59","LEDGERBENCH DEMO LTD","21-28-78 52114031","acct-2026350001-3"
"09/09/2025","TFR","TFR AURORA CONSULTING LTD REF500980","9596.52","LEDGERBENCH DEMO LTD","21-28-78 52114031","acct-2026350001-3"
"11/09/2025","SO","SO LARKSPUR TRAVEL REF414158","-1144.42","LEDGERBENCH DEMO LTD","21-28-78 52114031","acct-2026350001-3"
"11/09/2025","TFR","TFR HARBOURLIGHT IT REF295657","13063.07","LEDGERBENCH DEMO LTD","21-28-78 52114031","acct-2026350001-3"
"12/09/2025","CR","CR BRAMBLE LOGISTICS REF207877","9964.56","LEDGERBENCH DEMO LTD","21-28-78 52114031","acct-2026350001-3"
"12/09/2025","DD","DD DELPHINIUM MEDIA REF678609","-4965.74","LEDGERBENCH DEMO LTD","21-28-78 52114031","acct-2026350001-3"
"14/09/2025","CR","CR FENWICK & PARTNERS REF685759","1148.21","LEDGERBENCH DEMO LTD","21-28-78 52114031","acct-2026350001-3"
"17/09/2025","BP","BP LARKSPUR TRAVEL REF137586","-10725.42","LEDGERBENCH DEMO LTD","21-28-78 52114031","acct-2026350001-3"
"17/09/2025","TFR","TFR HARBOURLIGHT IT REF397323","10603.25","LEDGERBENCH DEMO LTD","21-28-78 52114031","acct-2026350001-3"
"20/09/2025","FPI","FPI MOORLAND TELECOM REF158992","10831.35","LEDGERBENCH DEMO LTD","21-28-78 52114031","acct-2026350001-3"
"22/09/2025","TFR","TFR IRONBRIDGE TOOLING REF357647","8400.29","LEDGERBENCH DEMO LTD","21-28-78 52114031","acct-2026350001-3"
"23/09/2025","CR","CR EASTFIELD ENERGY REF617575","1638.69","LEDGERBENCH DEMO LTD","21-28-78 52114031","acct-2026350001-3"
"25/09/2025","FPI","FPI DELPHINIUM MEDIA REF196264","6254.16","LEDGERBENCH DEMO LTD","21-28-78 52114031","acct-2026350001-3"
"26/09/2025","TFR","TFR AURORA CONSULTING LTD REF198004","14914.32","LEDGERBENCH DEMO LTD","21-28-78 52114031","acct-2026350001-3"
"26/09/2025","FPI","FPI AURORA CONSULTING LTD REF134975","550.92","LEDGERBENCH DEMO LTD","21-28-78 52114031","acct-2026350001-3"
"27/09/2025","SO","SO HARBOURLIGHT IT REF125122","-4752.39","LEDGERBENCH DEMO LTD","21-28-78 52114031","acct-2026350001-3"
"27/09/2025","CR","CR BRAMBLE LOGISTICS REF903274","755.17","LEDGERBENCH DEMO LTD","21-28-78 52114031","acct-2026350001-3"
"30/09/2025","DD","DD HARBOURLIGHT IT REF737189","-3690.90","LEDGERBENCH DEMO LTD","21-28-78 52114031","acct-2026350001-3"
"30/09/2025","DD","DD HARBOURLIGHT IT REF737190","-3690.90","LEDGERBENCH DEMO LTD","21-28-78 52114031","acct-2026350001-3"
"30/09/2025","SO","SO MOORLAND TELECOM REF857465","-5775.01","LEDGERBENCH DEMO LTD","21-28-78 52114031","acct-2026350001-3"
 

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-2026350001-1£146,416.29
acct-2026350001-2−£93,009.46
acct-2026350001-3£184,628.53

Recorded runs on this case

  • wrongSingle prompt2 steps · 10,913 tokens · Confidence medium

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

  • wrongAgent with tools17 steps · 29,166 tokens · Confidence high

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

Step through any of these on the demo page.