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rounding_trap

rounding_trap-2026400004

Amount precision is inconsistent across entries.

expects rounding_trap

Statement files

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

bnp_camt053.xml14 changed lines · first at line 35
<?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-2026400004-2-2025-02-28</MsgId>
<CreDtTm>2025-02-28T23:59:00+00:00</CreDtTm>
</GrpHdr>
<Stmt>
<Id>acct-2026400004-2</Id>
<ElctrncSeqNb>1</ElctrncSeqNb>
<CreDtTm>2025-02-28T23:59:00+00:00</CreDtTm>
<FrToDt>
<FrDtTm>2025-02-01T00:00:00+00:00</FrDtTm>
<ToDtTm>2025-02-28T23:59:59+00:00</ToDtTm>
</FrToDt>
<Acct>
<Id>
<IBAN>GB46LBEN25296618069132</IBAN>
</Id>
<Ccy>GBP</Ccy>
</Acct>
<Bal>
<Tp>
<CdOrPrtry>
<Cd>OPBD</Cd>
</CdOrPrtry>
</Tp>
<Amt Ccy="GBP">10370.59</Amt>
<CdtDbtInd>CRDT</CdtDbtInd>
<Dt>
<Dt>2025-02-01</Dt>
</Dt>
</Bal>
<Ntry>
<Amt Ccy="GBP">540.0100</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-02-01</Dt>
</BookgDt>
<ValDt>
<Dt>2025-02-01</Dt>
</ValDt>
<AcctSvcrRef>acct-2026400004-2-t001</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>BP EASTFIELD ENERGY REF615501</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">9296.190</Amt>
<CdtDbtInd>CRDT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-02-01</Dt>
</BookgDt>
<ValDt>
<Dt>2025-02-01</Dt>
</ValDt>
<AcctSvcrRef>acct-2026400004-2-t021</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>TFR EASTFIELD ENERGY REF282645</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">4863.81</Amt>
<CdtDbtInd>CRDT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-02-03</Dt>
</BookgDt>
<ValDt>
<Dt>2025-02-03</Dt>
</ValDt>
<AcctSvcrRef>acct-2026400004-2-t004</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>CR JUNIPER PAYROLL REF505647</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">3836.30</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-02-04</Dt>
</BookgDt>
<ValDt>
<Dt>2025-02-04</Dt>
</ValDt>
<AcctSvcrRef>acct-2026400004-2-t007</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>DD NORTHGATE CLEANING REF843939</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">10640.18</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-02-04</Dt>
</BookgDt>
<ValDt>
<Dt>2025-02-04</Dt>
</ValDt>
<AcctSvcrRef>acct-2026400004-2-t027</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>FPO FENWICK &amp; PARTNERS REF953891</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">9784.3900</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-02-05</Dt>
</BookgDt>
<ValDt>
<Dt>2025-02-05</Dt>
</ValDt>
<AcctSvcrRef>acct-2026400004-2-t018</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>FPO BRAMBLE LOGISTICS REF387185</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">8422.42</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-02-05</Dt>
</BookgDt>
<ValDt>
<Dt>2025-02-05</Dt>
</ValDt>
<AcctSvcrRef>acct-2026400004-2-t024</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>DD MOORLAND TELECOM REF762440</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">11254.850</Amt>
<CdtDbtInd>CRDT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-02-05</Dt>
</BookgDt>
<ValDt>
<Dt>2025-02-05</Dt>
</ValDt>
<AcctSvcrRef>acct-2026400004-2-t026</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>TFR LARKSPUR TRAVEL REF193958</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">3091.5500</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-02-06</Dt>
</BookgDt>
<ValDt>
<Dt>2025-02-06</Dt>
</ValDt>
<AcctSvcrRef>acct-2026400004-2-t002</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>FPO HARBOURLIGHT IT REF568928</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">10852.210</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-02-07</Dt>
</BookgDt>
<ValDt>
<Dt>2025-02-07</Dt>
</ValDt>
<AcctSvcrRef>acct-2026400004-2-t011</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>FPO OSPREY LEASING REF702097</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">7887.6500</Amt>
<CdtDbtInd>CRDT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-02-08</Dt>
</BookgDt>
<ValDt>
<Dt>2025-02-08</Dt>
</ValDt>
<AcctSvcrRef>acct-2026400004-2-t020</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>FPI NORTHGATE CLEANING REF561893</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">9038.49</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-02-09</Dt>
</BookgDt>
<ValDt>
<Dt>2025-02-09</Dt>
</ValDt>
<AcctSvcrRef>acct-2026400004-2-t010</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>FPO GREENHOLM FOODS REF359105</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">8471.170</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-02-12</Dt>
</BookgDt>
<ValDt>
<Dt>2025-02-12</Dt>
</ValDt>
<AcctSvcrRef>acct-2026400004-2-t003</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>BP AURORA CONSULTING LTD REF840540</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">10420.30</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-02-12</Dt>
</BookgDt>
<ValDt>
<Dt>2025-02-12</Dt>
</ValDt>
<AcctSvcrRef>acct-2026400004-2-t015</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>DD JUNIPER PAYROLL REF225704</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">8315.6900</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-02-13</Dt>
</BookgDt>
<ValDt>
<Dt>2025-02-13</Dt>
</ValDt>
<AcctSvcrRef>acct-2026400004-2-t009</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>BP MOORLAND TELECOM REF182506</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">7410.520</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-02-14</Dt>
</BookgDt>
<ValDt>
<Dt>2025-02-14</Dt>
</ValDt>
<AcctSvcrRef>acct-2026400004-2-t013</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>SO CASTLEGATE PROPERTY REF184502</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">10859.00</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-02-15</Dt>
</BookgDt>
<ValDt>
<Dt>2025-02-15</Dt>
</ValDt>
<AcctSvcrRef>acct-2026400004-2-t008</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>DD IRONBRIDGE TOOLING REF900007</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">6197.1900</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-02-15</Dt>
</BookgDt>
<ValDt>
<Dt>2025-02-15</Dt>
</ValDt>
<AcctSvcrRef>acct-2026400004-2-t012</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>BP DELPHINIUM MEDIA REF361568</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">14208.18</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-02-15</Dt>
</BookgDt>
<ValDt>
<Dt>2025-02-15</Dt>
</ValDt>
<AcctSvcrRef>acct-2026400004-2-t025</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>FPO BRAMBLE LOGISTICS REF986312</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">6234.59</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-02-19</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: 78-52-69 44760210
Account reference: acct-2026400004-1
Statement period: 01 Feb 2025 to 28 Feb 2025
Currency: GBP
Opening balance: 249034.37
Date Payment type Details Paid out Paid in
02 Feb 2025 BP NORTHGATE CLEANING REF602398 14260.64
02 Feb 2025 FPI FENWICK & PARTNERS REF997747 12637.18
03 Feb 2025 FPI AURORA CONSULTING LTD REF627232 10792.92
04 Feb 2025 CR HARBOURLIGHT IT REF185789 13872.02
04 Feb 2025 FPI NORTHGATE CLEANING REF782704 1429.98
07 Feb 2025 CR NORTHGATE CLEANING REF330936 663.66
07 Feb 2025 BP EASTFIELD ENERGY REF699898 5115.14
08 Feb 2025 DD AURORA CONSULTING LTD REF654783 1290.14
08 Feb 2025 SO FENWICK & PARTNERS REF637886 3294.73
10 Feb 2025 SO AURORA CONSULTING LTD REF184282 11196.89
12 Feb 2025 BP AURORA CONSULTING LTD REF870356 11963.55
13 Feb 2025 DD IRONBRIDGE TOOLING REF476097 10056.45
18 Feb 2025 BP DELPHINIUM MEDIA REF349675 11245.26
19 Feb 2025 BP KESTREL INSURANCE REF801655 12525.92
22 Feb 2025 DD IRONBRIDGE TOOLING REF153998 10416.29
22 Feb 2025 FPI NORTHGATE CLEANING REF385619 7535.47
23 Feb 2025 SO LARKSPUR TRAVEL REF685614 818.99
23 Feb 2025 SO LARKSPUR TRAVEL REF402221 4857.40
24 Feb 2025 DD KESTREL INSURANCE REF461256 11494.64
24 Feb 2025 FPI FENWICK & PARTNERS REF630061 3725.57
25 Feb 2025 FPO EASTFIELD ENERGY REF577474 1343.15
25 Feb 2025 DD HARBOURLIGHT IT REF220713 4725.45
26 Feb 2025 DD NORTHGATE CLEANING REF202936 5913.77
27 Feb 2025 TFR OSPREY LEASING REF930983 9619.00
27 Feb 2025 TFR JUNIPER PAYROLL REF553253 227.03
28 Feb 2025 CR FENWICK & PARTNERS REF530010 9848.27
rbs_transactions.csvUntouched by this perturbation
"Date","Type","Description","Value","Account Name","Account Number","Ledger Ref"
"01/02/2025","BAL","OPENING BALANCE","240243.35","LEDGERBENCH DEMO LTD","48-20-67 56098522","acct-2026400004-3"
"04/02/2025","FPO","FPO KESTREL INSURANCE REF898901","-11853.38","LEDGERBENCH DEMO LTD","48-20-67 56098522","acct-2026400004-3"
"06/02/2025","BP","BP MOORLAND TELECOM REF460297","-10777.45","LEDGERBENCH DEMO LTD","48-20-67 56098522","acct-2026400004-3"
"06/02/2025","FPO","FPO MOORLAND TELECOM REF547320","-4183.17","LEDGERBENCH DEMO LTD","48-20-67 56098522","acct-2026400004-3"
"06/02/2025","BP","BP NORTHGATE CLEANING REF839858","-14759.75","LEDGERBENCH DEMO LTD","48-20-67 56098522","acct-2026400004-3"
"10/02/2025","SO","SO OSPREY LEASING REF343458","-9070.39","LEDGERBENCH DEMO LTD","48-20-67 56098522","acct-2026400004-3"
"11/02/2025","SO","SO MOORLAND TELECOM REF682750","-9337.18","LEDGERBENCH DEMO LTD","48-20-67 56098522","acct-2026400004-3"
"11/02/2025","FPO","FPO LARKSPUR TRAVEL REF647159","-4975.88","LEDGERBENCH DEMO LTD","48-20-67 56098522","acct-2026400004-3"
"11/02/2025","FPO","FPO JUNIPER PAYROLL REF949803","-11183.49","LEDGERBENCH DEMO LTD","48-20-67 56098522","acct-2026400004-3"
"12/02/2025","SO","SO IRONBRIDGE TOOLING REF107744","-9936.46","LEDGERBENCH DEMO LTD","48-20-67 56098522","acct-2026400004-3"
"15/02/2025","DD","DD LARKSPUR TRAVEL REF860370","-10993.59","LEDGERBENCH DEMO LTD","48-20-67 56098522","acct-2026400004-3"
"16/02/2025","BP","BP DELPHINIUM MEDIA REF820177","-3224.16","LEDGERBENCH DEMO LTD","48-20-67 56098522","acct-2026400004-3"
"16/02/2025","DD","DD AURORA CONSULTING LTD REF449302","-6488.02","LEDGERBENCH DEMO LTD","48-20-67 56098522","acct-2026400004-3"
"18/02/2025","FPO","FPO GREENHOLM FOODS REF166114","-7409.46","LEDGERBENCH DEMO LTD","48-20-67 56098522","acct-2026400004-3"
"20/02/2025","DD","DD GREENHOLM FOODS REF882026","-12520.39","LEDGERBENCH DEMO LTD","48-20-67 56098522","acct-2026400004-3"
"21/02/2025","BP","BP DELPHINIUM MEDIA REF684860","-4100.60","LEDGERBENCH DEMO LTD","48-20-67 56098522","acct-2026400004-3"
"22/02/2025","SO","SO OSPREY LEASING REF146768","-814.27","LEDGERBENCH DEMO LTD","48-20-67 56098522","acct-2026400004-3"
"22/02/2025","FPO","FPO NORTHGATE CLEANING REF190640","-10779.50","LEDGERBENCH DEMO LTD","48-20-67 56098522","acct-2026400004-3"
"23/02/2025","FPO","FPO LARKSPUR TRAVEL REF110474","-7322.74","LEDGERBENCH DEMO LTD","48-20-67 56098522","acct-2026400004-3"
"26/02/2025","DD","DD NORTHGATE CLEANING REF410543","-2672.33","LEDGERBENCH DEMO LTD","48-20-67 56098522","acct-2026400004-3"
"26/02/2025","SO","SO IRONBRIDGE TOOLING REF556335","-422.25","LEDGERBENCH DEMO LTD","48-20-67 56098522","acct-2026400004-3"
"26/02/2025","FPO","FPO NORTHGATE CLEANING REF187563","-7051.06","LEDGERBENCH DEMO LTD","48-20-67 56098522","acct-2026400004-3"
"27/02/2025","BP","BP AURORA CONSULTING LTD REF961971","-11208.44","LEDGERBENCH DEMO LTD","48-20-67 56098522","acct-2026400004-3"
"28/02/2025","FPI","FPI DELPHINIUM MEDIA REF597818","323.51","LEDGERBENCH DEMO LTD","48-20-67 56098522","acct-2026400004-3"
"28/02/2025","BP","BP AURORA CONSULTING LTD REF572400","-5278.34","LEDGERBENCH DEMO LTD","48-20-67 56098522","acct-2026400004-3"
 

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-2026400004-1£198,867.06
acct-2026400004-2−£92,529.86
acct-2026400004-3£64,204.56

Recorded runs on this case

  • wrongSingle prompt2 steps · 12,867 tokens · Confidence high

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

  • exactAgent with tools22 steps · 62,318 tokens · Confidence high

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

Step through any of these on the demo page.