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rounding_trap

rounding_trap-2026400000

Amount precision is inconsistent across entries.

expects rounding_trap

Statement files

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

bnp_camt053.xml12 changed lines · first at line 54
<?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-2026400000-2-2025-04-30</MsgId>
<CreDtTm>2025-04-30T23:59:00+00:00</CreDtTm>
</GrpHdr>
<Stmt>
<Id>acct-2026400000-2</Id>
<ElctrncSeqNb>1</ElctrncSeqNb>
<CreDtTm>2025-04-30T23:59:00+00:00</CreDtTm>
<FrToDt>
<FrDtTm>2025-04-01T00:00:00+00:00</FrDtTm>
<ToDtTm>2025-04-30T23:59:59+00:00</ToDtTm>
</FrToDt>
<Acct>
<Id>
<IBAN>GB85LBEN87611057833611</IBAN>
</Id>
<Ccy>GBP</Ccy>
</Acct>
<Bal>
<Tp>
<CdOrPrtry>
<Cd>OPBD</Cd>
</CdOrPrtry>
</Tp>
<Amt Ccy="GBP">248710.26</Amt>
<CdtDbtInd>CRDT</CdtDbtInd>
<Dt>
<Dt>2025-04-01</Dt>
</Dt>
</Bal>
<Ntry>
<Amt Ccy="GBP">1147.05</Amt>
<CdtDbtInd>CRDT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-04-01</Dt>
</BookgDt>
<ValDt>
<Dt>2025-04-01</Dt>
</ValDt>
<AcctSvcrRef>acct-2026400000-2-t012</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>TFR HARBOURLIGHT IT REF830563</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">10309.4700</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-04-03</Dt>
</BookgDt>
<ValDt>
<Dt>2025-04-03</Dt>
</ValDt>
<AcctSvcrRef>acct-2026400000-2-t022</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>DD MOORLAND TELECOM REF658339</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">3016.14</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-04-06</Dt>
</BookgDt>
<ValDt>
<Dt>2025-04-06</Dt>
</ValDt>
<AcctSvcrRef>acct-2026400000-2-t023</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>FPO JUNIPER PAYROLL REF682150</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">9939.79</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-04-09</Dt>
</BookgDt>
<ValDt>
<Dt>2025-04-09</Dt>
</ValDt>
<AcctSvcrRef>acct-2026400000-2-t011</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>BP CASTLEGATE PROPERTY REF864626</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">13415.470</Amt>
<CdtDbtInd>CRDT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-04-10</Dt>
</BookgDt>
<ValDt>
<Dt>2025-04-10</Dt>
</ValDt>
<AcctSvcrRef>acct-2026400000-2-t013</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>CR FENWICK &amp; PARTNERS REF441283</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">12453.6400</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-04-11</Dt>
</BookgDt>
<ValDt>
<Dt>2025-04-11</Dt>
</ValDt>
<AcctSvcrRef>acct-2026400000-2-t002</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>SO MOORLAND TELECOM REF101963</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">10703.410</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-04-11</Dt>
</BookgDt>
<ValDt>
<Dt>2025-04-11</Dt>
</ValDt>
<AcctSvcrRef>acct-2026400000-2-t017</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>SO OSPREY LEASING REF156529</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">1303.6700</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-04-12</Dt>
</BookgDt>
<ValDt>
<Dt>2025-04-12</Dt>
</ValDt>
<AcctSvcrRef>acct-2026400000-2-t005</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>SO JUNIPER PAYROLL REF749555</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">7694.84</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-04-14</Dt>
</BookgDt>
<ValDt>
<Dt>2025-04-14</Dt>
</ValDt>
<AcctSvcrRef>acct-2026400000-2-t014</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>SO CASTLEGATE PROPERTY REF819087</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">7306.990</Amt>
<CdtDbtInd>CRDT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-04-14</Dt>
</BookgDt>
<ValDt>
<Dt>2025-04-14</Dt>
</ValDt>
<AcctSvcrRef>acct-2026400000-2-t020</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>CR LARKSPUR TRAVEL REF106302</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">12305.07</Amt>
<CdtDbtInd>CRDT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-04-15</Dt>
</BookgDt>
<ValDt>
<Dt>2025-04-15</Dt>
</ValDt>
<AcctSvcrRef>acct-2026400000-2-t004</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>FPI IRONBRIDGE TOOLING REF935709</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">4799.1500</Amt>
<CdtDbtInd>CRDT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-04-19</Dt>
</BookgDt>
<ValDt>
<Dt>2025-04-19</Dt>
</ValDt>
<AcctSvcrRef>acct-2026400000-2-t021</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>TFR LARKSPUR TRAVEL REF598699</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">8225.86</Amt>
<CdtDbtInd>CRDT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-04-21</Dt>
</BookgDt>
<ValDt>
<Dt>2025-04-21</Dt>
</ValDt>
<AcctSvcrRef>acct-2026400000-2-t003</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>CR AURORA CONSULTING LTD REF264728</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">1311.73</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-04-21</Dt>
</BookgDt>
<ValDt>
<Dt>2025-04-21</Dt>
</ValDt>
<AcctSvcrRef>acct-2026400000-2-t007</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>DD NORTHGATE CLEANING REF636760</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">2166.84</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-04-21</Dt>
</BookgDt>
<ValDt>
<Dt>2025-04-21</Dt>
</ValDt>
<AcctSvcrRef>acct-2026400000-2-t010</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>SO DELPHINIUM MEDIA REF540392</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">7157.410</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-04-22</Dt>
</BookgDt>
<ValDt>
<Dt>2025-04-22</Dt>
</ValDt>
<AcctSvcrRef>acct-2026400000-2-t006</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>SO LARKSPUR TRAVEL REF757445</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">4213.52</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-04-24</Dt>
</BookgDt>
<ValDt>
<Dt>2025-04-24</Dt>
</ValDt>
<AcctSvcrRef>acct-2026400000-2-t018</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>FPO BRAMBLE LOGISTICS REF111444</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">3445.4500</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-04-25</Dt>
</BookgDt>
<ValDt>
<Dt>2025-04-25</Dt>
</ValDt>
<AcctSvcrRef>acct-2026400000-2-t008</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>SO MOORLAND TELECOM REF981575</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">4307.190</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-04-25</Dt>
</BookgDt>
<ValDt>
<Dt>2025-04-25</Dt>
</ValDt>
<AcctSvcrRef>acct-2026400000-2-t015</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>DD GREENHOLM FOODS REF296570</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">13174.42</Amt>
<CdtDbtInd>CRDT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-04-25</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: 59-59-64 91742618
Account reference: acct-2026400000-1
Statement period: 01 Apr 2025 to 30 Apr 2025
Currency: GBP
Opening balance: 37981.86
Date Payment type Details Paid out Paid in
01 Apr 2025 DD IRONBRIDGE TOOLING REF883199 2686.92
01 Apr 2025 BP JUNIPER PAYROLL REF573160 14213.80
08 Apr 2025 BP EASTFIELD ENERGY REF695195 12264.61
10 Apr 2025 BP BRAMBLE LOGISTICS REF686136 3771.13
11 Apr 2025 DD BRAMBLE LOGISTICS REF768897 7013.51
11 Apr 2025 CR FENWICK & PARTNERS REF828102 11655.25
11 Apr 2025 TFR GREENHOLM FOODS REF863533 14861.17
14 Apr 2025 BP BRAMBLE LOGISTICS REF477945 72.11
18 Apr 2025 FPO GREENHOLM FOODS REF462858 3391.18
20 Apr 2025 FPO DELPHINIUM MEDIA REF133179 13662.89
20 Apr 2025 SO FENWICK & PARTNERS REF153492 11632.53
21 Apr 2025 TFR BRAMBLE LOGISTICS REF309332 9251.95
23 Apr 2025 FPI GREENHOLM FOODS REF618084 14904.02
24 Apr 2025 FPI BRAMBLE LOGISTICS REF720698 2931.95
26 Apr 2025 TFR OSPREY LEASING REF254875 11052.85
28 Apr 2025 DD LARKSPUR TRAVEL REF180855 11101.52
29 Apr 2025 TFR AURORA CONSULTING LTD REF150640 14085.90
29 Apr 2025 FPO CASTLEGATE PROPERTY REF121379 10905.90
30 Apr 2025 BP IRONBRIDGE TOOLING REF649256 3850.58
rbs_transactions.csvUntouched by this perturbation
"Date","Type","Description","Value","Account Name","Account Number","Ledger Ref"
"01/04/2025","BAL","OPENING BALANCE","37683.28","LEDGERBENCH DEMO LTD","60-60-13 81436460","acct-2026400000-3"
"03/04/2025","CR","CR GREENHOLM FOODS REF183145","7703.74","LEDGERBENCH DEMO LTD","60-60-13 81436460","acct-2026400000-3"
"03/04/2025","CR","CR GREENHOLM FOODS REF103840","3167.82","LEDGERBENCH DEMO LTD","60-60-13 81436460","acct-2026400000-3"
"03/04/2025","FPO","FPO OSPREY LEASING REF463150","-9840.87","LEDGERBENCH DEMO LTD","60-60-13 81436460","acct-2026400000-3"
"04/04/2025","DD","DD AURORA CONSULTING LTD REF109892","-8434.68","LEDGERBENCH DEMO LTD","60-60-13 81436460","acct-2026400000-3"
"05/04/2025","SO","SO EASTFIELD ENERGY REF812738","-14871.43","LEDGERBENCH DEMO LTD","60-60-13 81436460","acct-2026400000-3"
"07/04/2025","FPO","FPO MOORLAND TELECOM REF503312","-9352.52","LEDGERBENCH DEMO LTD","60-60-13 81436460","acct-2026400000-3"
"08/04/2025","TFR","TFR AURORA CONSULTING LTD REF492174","13258.87","LEDGERBENCH DEMO LTD","60-60-13 81436460","acct-2026400000-3"
"08/04/2025","FPO","FPO KESTREL INSURANCE REF713364","-6334.77","LEDGERBENCH DEMO LTD","60-60-13 81436460","acct-2026400000-3"
"09/04/2025","FPO","FPO OSPREY LEASING REF764916","-13316.47","LEDGERBENCH DEMO LTD","60-60-13 81436460","acct-2026400000-3"
"10/04/2025","BP","BP NORTHGATE CLEANING REF718308","-5115.33","LEDGERBENCH DEMO LTD","60-60-13 81436460","acct-2026400000-3"
"11/04/2025","FPO","FPO MOORLAND TELECOM REF574299","-7899.07","LEDGERBENCH DEMO LTD","60-60-13 81436460","acct-2026400000-3"
"11/04/2025","BP","BP MOORLAND TELECOM REF229454","-5966.47","LEDGERBENCH DEMO LTD","60-60-13 81436460","acct-2026400000-3"
"11/04/2025","CR","CR JUNIPER PAYROLL REF680655","8052.13","LEDGERBENCH DEMO LTD","60-60-13 81436460","acct-2026400000-3"
"11/04/2025","BP","BP CASTLEGATE PROPERTY REF579090","-12651.01","LEDGERBENCH DEMO LTD","60-60-13 81436460","acct-2026400000-3"
"12/04/2025","SO","SO AURORA CONSULTING LTD REF674884","-6740.83","LEDGERBENCH DEMO LTD","60-60-13 81436460","acct-2026400000-3"
"12/04/2025","CR","CR EASTFIELD ENERGY REF301541","6364.71","LEDGERBENCH DEMO LTD","60-60-13 81436460","acct-2026400000-3"
"13/04/2025","FPO","FPO MOORLAND TELECOM REF646560","-12612.70","LEDGERBENCH DEMO LTD","60-60-13 81436460","acct-2026400000-3"
"17/04/2025","DD","DD KESTREL INSURANCE REF473833","-1216.56","LEDGERBENCH DEMO LTD","60-60-13 81436460","acct-2026400000-3"
"18/04/2025","SO","SO OSPREY LEASING REF998407","-13178.85","LEDGERBENCH DEMO LTD","60-60-13 81436460","acct-2026400000-3"
"18/04/2025","TFR","TFR OSPREY LEASING REF680931","7925.07","LEDGERBENCH DEMO LTD","60-60-13 81436460","acct-2026400000-3"
"20/04/2025","FPO","FPO NORTHGATE CLEANING REF234256","-10440.93","LEDGERBENCH DEMO LTD","60-60-13 81436460","acct-2026400000-3"
"21/04/2025","TFR","TFR LARKSPUR TRAVEL REF465541","1659.08","LEDGERBENCH DEMO LTD","60-60-13 81436460","acct-2026400000-3"
"22/04/2025","TFR","TFR HARBOURLIGHT IT REF356450","13335.95","LEDGERBENCH DEMO LTD","60-60-13 81436460","acct-2026400000-3"
"22/04/2025","SO","SO MOORLAND TELECOM REF293465","-3701.54","LEDGERBENCH DEMO LTD","60-60-13 81436460","acct-2026400000-3"
"22/04/2025","DD","DD FENWICK & PARTNERS REF403409","-10082.72","LEDGERBENCH DEMO LTD","60-60-13 81436460","acct-2026400000-3"
"25/04/2025","CR","CR NORTHGATE CLEANING REF141717","1035.00","LEDGERBENCH DEMO LTD","60-60-13 81436460","acct-2026400000-3"
"26/04/2025","FPI","FPI NORTHGATE CLEANING REF461116","10902.13","LEDGERBENCH DEMO LTD","60-60-13 81436460","acct-2026400000-3"
"27/04/2025","SO","SO GREENHOLM FOODS REF259619","-1728.32","LEDGERBENCH DEMO LTD","60-60-13 81436460","acct-2026400000-3"
"28/04/2025","BP","BP GREENHOLM FOODS REF677317","-10332.53","LEDGERBENCH DEMO LTD","60-60-13 81436460","acct-2026400000-3"
"30/04/2025","FPI","FPI CASTLEGATE PROPERTY REF638106","3727.58","LEDGERBENCH DEMO LTD","60-60-13 81436460","acct-2026400000-3"
 

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-2026400000-1£22,158.27
acct-2026400000-2£214,365.66
acct-2026400000-3−£49,002.24

Recorded runs on this case

  • wrongSingle prompt2 steps · 11,853 tokens · Confidence high

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

  • exactAgent with tools17 steps · 29,525 tokens · Confidence high

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

Step through any of these on the demo page.