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rounding_trap

rounding_trap-2026400002

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 73
<?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-2026400002-2-2025-03-31</MsgId>
<CreDtTm>2025-03-31T23:59:00+00:00</CreDtTm>
</GrpHdr>
<Stmt>
<Id>acct-2026400002-2</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>GB56LBEN15625212558839</IBAN>
</Id>
<Ccy>GBP</Ccy>
</Acct>
<Bal>
<Tp>
<CdOrPrtry>
<Cd>OPBD</Cd>
</CdOrPrtry>
</Tp>
<Amt Ccy="GBP">245525.58</Amt>
<CdtDbtInd>CRDT</CdtDbtInd>
<Dt>
<Dt>2025-03-01</Dt>
</Dt>
</Bal>
<Ntry>
<Amt Ccy="GBP">13240.18</Amt>
<CdtDbtInd>CRDT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-03-01</Dt>
</BookgDt>
<ValDt>
<Dt>2025-03-01</Dt>
</ValDt>
<AcctSvcrRef>acct-2026400002-2-t009</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>TFR AURORA CONSULTING LTD REF300789</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">13852.01</Amt>
<CdtDbtInd>CRDT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-03-03</Dt>
</BookgDt>
<ValDt>
<Dt>2025-03-03</Dt>
</ValDt>
<AcctSvcrRef>acct-2026400002-2-t001</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>CR MOORLAND TELECOM REF822763</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">1469.5700</Amt>
<CdtDbtInd>CRDT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-03-05</Dt>
</BookgDt>
<ValDt>
<Dt>2025-03-05</Dt>
</ValDt>
<AcctSvcrRef>acct-2026400002-2-t013</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>FPI OSPREY LEASING REF917212</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">89.89</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-03-05</Dt>
</BookgDt>
<ValDt>
<Dt>2025-03-05</Dt>
</ValDt>
<AcctSvcrRef>acct-2026400002-2-t018</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>BP OSPREY LEASING REF694915</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">8719.97</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-03-06</Dt>
</BookgDt>
<ValDt>
<Dt>2025-03-06</Dt>
</ValDt>
<AcctSvcrRef>acct-2026400002-2-t012</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>DD KESTREL INSURANCE REF198177</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">8215.470</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-03-06</Dt>
</BookgDt>
<ValDt>
<Dt>2025-03-06</Dt>
</ValDt>
<AcctSvcrRef>acct-2026400002-2-t022</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>FPO CASTLEGATE PROPERTY REF404183</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">3948.25</Amt>
<CdtDbtInd>CRDT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-03-10</Dt>
</BookgDt>
<ValDt>
<Dt>2025-03-10</Dt>
</ValDt>
<AcctSvcrRef>acct-2026400002-2-t006</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>CR DELPHINIUM MEDIA REF670948</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">10400.45</Amt>
<CdtDbtInd>CRDT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-03-11</Dt>
</BookgDt>
<ValDt>
<Dt>2025-03-11</Dt>
</ValDt>
<AcctSvcrRef>acct-2026400002-2-t014</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>TFR JUNIPER PAYROLL REF691448</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">2150.8400</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-03-11</Dt>
</BookgDt>
<ValDt>
<Dt>2025-03-11</Dt>
</ValDt>
<AcctSvcrRef>acct-2026400002-2-t016</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>FPO LARKSPUR TRAVEL REF970112</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">3652.21</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-03-11</Dt>
</BookgDt>
<ValDt>
<Dt>2025-03-11</Dt>
</ValDt>
<AcctSvcrRef>acct-2026400002-2-t021</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>DD AURORA CONSULTING LTD REF552825</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">4743.05</Amt>
<CdtDbtInd>CRDT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-03-11</Dt>
</BookgDt>
<ValDt>
<Dt>2025-03-11</Dt>
</ValDt>
<AcctSvcrRef>acct-2026400002-2-t024</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>FPI BRAMBLE LOGISTICS REF524036</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">12607.49</Amt>
<CdtDbtInd>CRDT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-03-11</Dt>
</BookgDt>
<ValDt>
<Dt>2025-03-11</Dt>
</ValDt>
<AcctSvcrRef>acct-2026400002-2-t025</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>TFR OSPREY LEASING REF550400</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">12945.4</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-03-14</Dt>
</BookgDt>
<ValDt>
<Dt>2025-03-14</Dt>
</ValDt>
<AcctSvcrRef>acct-2026400002-2-t004</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>BP JUNIPER PAYROLL REF922480</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">8635.9500</Amt>
<CdtDbtInd>CRDT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-03-14</Dt>
</BookgDt>
<ValDt>
<Dt>2025-03-14</Dt>
</ValDt>
<AcctSvcrRef>acct-2026400002-2-t007</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>FPI OSPREY LEASING REF483542</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">1754.350</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-03-14</Dt>
</BookgDt>
<ValDt>
<Dt>2025-03-14</Dt>
</ValDt>
<AcctSvcrRef>acct-2026400002-2-t020</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>DD JUNIPER PAYROLL REF819854</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">12857.2500</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-03-16</Dt>
</BookgDt>
<ValDt>
<Dt>2025-03-16</Dt>
</ValDt>
<AcctSvcrRef>acct-2026400002-2-t002</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>SO JUNIPER PAYROLL REF967769</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">4850.06</Amt>
<CdtDbtInd>CRDT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-03-17</Dt>
</BookgDt>
<ValDt>
<Dt>2025-03-17</Dt>
</ValDt>
<AcctSvcrRef>acct-2026400002-2-t019</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>FPI EASTFIELD ENERGY REF137799</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">10900.630</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-03-18</Dt>
</BookgDt>
<ValDt>
<Dt>2025-03-18</Dt>
</ValDt>
<AcctSvcrRef>acct-2026400002-2-t003</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>SO OSPREY LEASING REF689211</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">1419.65</Amt>
<CdtDbtInd>CRDT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-03-18</Dt>
</BookgDt>
<ValDt>
<Dt>2025-03-18</Dt>
</ValDt>
<AcctSvcrRef>acct-2026400002-2-t008</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>FPI DELPHINIUM MEDIA REF605284</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">8209.3300</Amt>
<CdtDbtInd>CRDT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-03-19</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: 70-31-37 59781895
Account reference: acct-2026400002-1
Statement period: 01 Mar 2025 to 31 Mar 2025
Currency: GBP
Opening balance: 95274.40
Date Payment type Details Paid out Paid in
01 Mar 2025 DD FENWICK & PARTNERS REF591577 2380.49
02 Mar 2025 FPO HARBOURLIGHT IT REF645732 14366.38
05 Mar 2025 FPI FENWICK & PARTNERS REF928344 10044.23
06 Mar 2025 BP OSPREY LEASING REF121975 7391.20
08 Mar 2025 BP CASTLEGATE PROPERTY REF215368 3772.41
10 Mar 2025 CR DELPHINIUM MEDIA REF744323 14055.93
11 Mar 2025 BP OSPREY LEASING REF924401 14872.37
11 Mar 2025 FPI JUNIPER PAYROLL REF804450 372.81
12 Mar 2025 TFR LARKSPUR TRAVEL REF801665 5230.17
13 Mar 2025 TFR MOORLAND TELECOM REF243708 9328.41
16 Mar 2025 SO MOORLAND TELECOM REF306529 8262.38
17 Mar 2025 DD OSPREY LEASING REF791708 1524.83
21 Mar 2025 DD KESTREL INSURANCE REF531033 1964.67
22 Mar 2025 FPO GREENHOLM FOODS REF924733 12464.03
24 Mar 2025 FPO IRONBRIDGE TOOLING REF776124 734.05
24 Mar 2025 CR DELPHINIUM MEDIA REF132299 13580.77
25 Mar 2025 BP JUNIPER PAYROLL REF534552 5562.30
26 Mar 2025 CR CASTLEGATE PROPERTY REF559137 8303.93
26 Mar 2025 FPI NORTHGATE CLEANING REF558223 6201.85
26 Mar 2025 FPI BRAMBLE LOGISTICS REF534306 5646.00
27 Mar 2025 FPO EASTFIELD ENERGY REF784785 9811.36
28 Mar 2025 CR KESTREL INSURANCE REF219788 12977.64
29 Mar 2025 SO GREENHOLM FOODS REF793843 2182.69
30 Mar 2025 SO AURORA CONSULTING LTD REF517815 5874.25
31 Mar 2025 FPO JUNIPER PAYROLL REF130953 5287.75
rbs_transactions.csvUntouched by this perturbation
"Date","Type","Description","Value","Account Name","Account Number","Ledger Ref"
"01/03/2025","BAL","OPENING BALANCE","56406.75","LEDGERBENCH DEMO LTD","84-39-52 83764547","acct-2026400002-3"
"02/03/2025","DD","DD HARBOURLIGHT IT REF381096","-4104.36","LEDGERBENCH DEMO LTD","84-39-52 83764547","acct-2026400002-3"
"03/03/2025","FPO","FPO JUNIPER PAYROLL REF346041","-13675.37","LEDGERBENCH DEMO LTD","84-39-52 83764547","acct-2026400002-3"
"03/03/2025","FPI","FPI LARKSPUR TRAVEL REF139932","307.63","LEDGERBENCH DEMO LTD","84-39-52 83764547","acct-2026400002-3"
"05/03/2025","BP","BP NORTHGATE CLEANING REF948087","-7999.82","LEDGERBENCH DEMO LTD","84-39-52 83764547","acct-2026400002-3"
"05/03/2025","FPO","FPO AURORA CONSULTING LTD REF996149","-14197.63","LEDGERBENCH DEMO LTD","84-39-52 83764547","acct-2026400002-3"
"08/03/2025","FPI","FPI BRAMBLE LOGISTICS REF686265","3487.74","LEDGERBENCH DEMO LTD","84-39-52 83764547","acct-2026400002-3"
"09/03/2025","SO","SO MOORLAND TELECOM REF910307","-4098.06","LEDGERBENCH DEMO LTD","84-39-52 83764547","acct-2026400002-3"
"09/03/2025","FPI","FPI MOORLAND TELECOM REF397009","3727.19","LEDGERBENCH DEMO LTD","84-39-52 83764547","acct-2026400002-3"
"13/03/2025","CR","CR HARBOURLIGHT IT REF131915","1499.53","LEDGERBENCH DEMO LTD","84-39-52 83764547","acct-2026400002-3"
"17/03/2025","FPO","FPO OSPREY LEASING REF854681","-417.71","LEDGERBENCH DEMO LTD","84-39-52 83764547","acct-2026400002-3"
"20/03/2025","TFR","TFR GREENHOLM FOODS REF982654","424.14","LEDGERBENCH DEMO LTD","84-39-52 83764547","acct-2026400002-3"
"20/03/2025","CR","CR HARBOURLIGHT IT REF569231","672.25","LEDGERBENCH DEMO LTD","84-39-52 83764547","acct-2026400002-3"
"21/03/2025","TFR","TFR FENWICK & PARTNERS REF506476","1473.29","LEDGERBENCH DEMO LTD","84-39-52 83764547","acct-2026400002-3"
"22/03/2025","BP","BP DELPHINIUM MEDIA REF206347","-11658.30","LEDGERBENCH DEMO LTD","84-39-52 83764547","acct-2026400002-3"
"24/03/2025","SO","SO NORTHGATE CLEANING REF251915","-6608.25","LEDGERBENCH DEMO LTD","84-39-52 83764547","acct-2026400002-3"
"25/03/2025","BP","BP EASTFIELD ENERGY REF798370","-131.26","LEDGERBENCH DEMO LTD","84-39-52 83764547","acct-2026400002-3"
"25/03/2025","TFR","TFR FENWICK & PARTNERS REF964311","5430.71","LEDGERBENCH DEMO LTD","84-39-52 83764547","acct-2026400002-3"
"29/03/2025","SO","SO GREENHOLM FOODS REF150938","-13663.55","LEDGERBENCH DEMO LTD","84-39-52 83764547","acct-2026400002-3"
"30/03/2025","DD","DD CASTLEGATE PROPERTY REF639784","-3925.65","LEDGERBENCH DEMO LTD","84-39-52 83764547","acct-2026400002-3"
 

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-2026400002-1£84,564.98
acct-2026400002-2£229,923.38
acct-2026400002-3−£7,050.73

Recorded runs on this case

  • exactSingle prompt2 steps · 10,795 tokens · Confidence high

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

  • exactAgent with tools20 steps · 42,705 tokens · Confidence high

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

Step through any of these on the demo page.