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rounding_trap

rounding_trap-2026400001

Amount precision is inconsistent across entries.

expects rounding_trap

Statement files

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

bnp_camt053.xml15 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-2026400001-2-2025-09-30</MsgId>
<CreDtTm>2025-09-30T23:59:00+00:00</CreDtTm>
</GrpHdr>
<Stmt>
<Id>acct-2026400001-2</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>GB13LBEN88864286921560</IBAN>
</Id>
<Ccy>GBP</Ccy>
</Acct>
<Bal>
<Tp>
<CdOrPrtry>
<Cd>OPBD</Cd>
</CdOrPrtry>
</Tp>
<Amt Ccy="GBP">60622.56</Amt>
<CdtDbtInd>CRDT</CdtDbtInd>
<Dt>
<Dt>2025-09-01</Dt>
</Dt>
</Bal>
<Ntry>
<Amt Ccy="GBP">6579.7300</Amt>
<CdtDbtInd>CRDT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-09-02</Dt>
</BookgDt>
<ValDt>
<Dt>2025-09-02</Dt>
</ValDt>
<AcctSvcrRef>acct-2026400001-2-t002</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>TFR FENWICK &amp; PARTNERS REF631403</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">1703.420</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-09-02</Dt>
</BookgDt>
<ValDt>
<Dt>2025-09-02</Dt>
</ValDt>
<AcctSvcrRef>acct-2026400001-2-t015</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>DD AURORA CONSULTING LTD REF601169</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">6305.79</Amt>
<CdtDbtInd>CRDT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-09-03</Dt>
</BookgDt>
<ValDt>
<Dt>2025-09-03</Dt>
</ValDt>
<AcctSvcrRef>acct-2026400001-2-t012</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>FPI LARKSPUR TRAVEL REF733130</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">4843.18</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-09-03</Dt>
</BookgDt>
<ValDt>
<Dt>2025-09-03</Dt>
</ValDt>
<AcctSvcrRef>acct-2026400001-2-t016</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>DD MOORLAND TELECOM REF341488</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">12919.91</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-09-03</Dt>
</BookgDt>
<ValDt>
<Dt>2025-09-03</Dt>
</ValDt>
<AcctSvcrRef>acct-2026400001-2-t020</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>SO DELPHINIUM MEDIA REF298900</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">7953.8200</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-09-05</Dt>
</BookgDt>
<ValDt>
<Dt>2025-09-05</Dt>
</ValDt>
<AcctSvcrRef>acct-2026400001-2-t030</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>FPO BRAMBLE LOGISTICS REF747195</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">4466.39</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-09-06</Dt>
</BookgDt>
<ValDt>
<Dt>2025-09-06</Dt>
</ValDt>
<AcctSvcrRef>acct-2026400001-2-t004</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>FPO AURORA CONSULTING LTD REF390912</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">13002.220</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-09-07</Dt>
</BookgDt>
<ValDt>
<Dt>2025-09-07</Dt>
</ValDt>
<AcctSvcrRef>acct-2026400001-2-t025</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>DD NORTHGATE CLEANING REF178468</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">13598.6400</Amt>
<CdtDbtInd>CRDT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-09-07</Dt>
</BookgDt>
<ValDt>
<Dt>2025-09-07</Dt>
</ValDt>
<AcctSvcrRef>acct-2026400001-2-t029</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>CR MOORLAND TELECOM REF519036</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">14877.810</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-09-08</Dt>
</BookgDt>
<ValDt>
<Dt>2025-09-08</Dt>
</ValDt>
<AcctSvcrRef>acct-2026400001-2-t023</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>FPO NORTHGATE CLEANING REF976546</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">11466.10</Amt>
<CdtDbtInd>CRDT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-09-09</Dt>
</BookgDt>
<ValDt>
<Dt>2025-09-09</Dt>
</ValDt>
<AcctSvcrRef>acct-2026400001-2-t011</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>CR FENWICK &amp; PARTNERS REF426198</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">14531.6500</Amt>
<CdtDbtInd>CRDT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-09-10</Dt>
</BookgDt>
<ValDt>
<Dt>2025-09-10</Dt>
</ValDt>
<AcctSvcrRef>acct-2026400001-2-t001</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>TFR NORTHGATE CLEANING REF822996</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">5513.620</Amt>
<CdtDbtInd>CRDT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-09-10</Dt>
</BookgDt>
<ValDt>
<Dt>2025-09-10</Dt>
</ValDt>
<AcctSvcrRef>acct-2026400001-2-t006</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>FPI OSPREY LEASING REF765361</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">8987.48</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-09-11</Dt>
</BookgDt>
<ValDt>
<Dt>2025-09-11</Dt>
</ValDt>
<AcctSvcrRef>acct-2026400001-2-t014</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>BP BRAMBLE LOGISTICS REF628264</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">10140.26</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-09-14</Dt>
</BookgDt>
<ValDt>
<Dt>2025-09-14</Dt>
</ValDt>
<AcctSvcrRef>acct-2026400001-2-t021</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>FPO KESTREL INSURANCE REF616887</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">4920.4900</Amt>
<CdtDbtInd>CRDT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-09-14</Dt>
</BookgDt>
<ValDt>
<Dt>2025-09-14</Dt>
</ValDt>
<AcctSvcrRef>acct-2026400001-2-t026</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>FPI FENWICK &amp; PARTNERS REF114466</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">1839.650</Amt>
<CdtDbtInd>CRDT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-09-16</Dt>
</BookgDt>
<ValDt>
<Dt>2025-09-16</Dt>
</ValDt>
<AcctSvcrRef>acct-2026400001-2-t019</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>TFR EASTFIELD ENERGY REF836375</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">13164.5600</Amt>
<CdtDbtInd>CRDT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-09-18</Dt>
</BookgDt>
<ValDt>
<Dt>2025-09-18</Dt>
</ValDt>
<AcctSvcrRef>acct-2026400001-2-t010</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>TFR DELPHINIUM MEDIA REF498618</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">570.98</Amt>
<CdtDbtInd>CRDT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-09-19</Dt>
</BookgDt>
<ValDt>
<Dt>2025-09-19</Dt>
</ValDt>
<AcctSvcrRef>acct-2026400001-2-t007</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>CR BRAMBLE LOGISTICS REF362627</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">160.15</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-09-20</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: 15-56-32 14983528
Account reference: acct-2026400001-1
Statement period: 01 Sep 2025 to 30 Sep 2025
Currency: GBP
Opening balance: 158793.94
Date Payment type Details Paid out Paid in
02 Sep 2025 BP OSPREY LEASING REF939305 14675.61
02 Sep 2025 FPO DELPHINIUM MEDIA REF664136 12611.80
04 Sep 2025 BP BRAMBLE LOGISTICS REF676305 6787.67
05 Sep 2025 FPI DELPHINIUM MEDIA REF631763 6147.36
08 Sep 2025 FPO MOORLAND TELECOM REF686124 14759.53
09 Sep 2025 DD CASTLEGATE PROPERTY REF587818 349.64
09 Sep 2025 BP JUNIPER PAYROLL REF586173 3222.86
12 Sep 2025 SO EASTFIELD ENERGY REF810725 8749.97
13 Sep 2025 FPO EASTFIELD ENERGY REF933061 9283.38
15 Sep 2025 TFR KESTREL INSURANCE REF660536 7328.50
19 Sep 2025 TFR OSPREY LEASING REF124936 2192.51
20 Sep 2025 TFR JUNIPER PAYROLL REF502649 11015.63
20 Sep 2025 TFR FENWICK & PARTNERS REF269515 14043.55
22 Sep 2025 BP OSPREY LEASING REF471807 12674.29
23 Sep 2025 FPI LARKSPUR TRAVEL REF576952 6312.60
24 Sep 2025 CR OSPREY LEASING REF655783 6266.80
26 Sep 2025 TFR FENWICK & PARTNERS REF792234 14412.16
27 Sep 2025 FPI FENWICK & PARTNERS REF314853 13872.67
28 Sep 2025 BP EASTFIELD ENERGY REF906213 2304.71
29 Sep 2025 SO AURORA CONSULTING LTD REF423076 12533.27
30 Sep 2025 SO FENWICK & PARTNERS REF326899 6568.89
rbs_transactions.csvUntouched by this perturbation
"Date","Type","Description","Value","Account Name","Account Number","Ledger Ref"
"01/09/2025","BAL","OPENING BALANCE","17755.68","LEDGERBENCH DEMO LTD","53-19-28 27570744","acct-2026400001-3"
"01/09/2025","FPO","FPO OSPREY LEASING REF883920","-3133.04","LEDGERBENCH DEMO LTD","53-19-28 27570744","acct-2026400001-3"
"02/09/2025","BP","BP MOORLAND TELECOM REF412051","-9639.86","LEDGERBENCH DEMO LTD","53-19-28 27570744","acct-2026400001-3"
"02/09/2025","FPI","FPI DELPHINIUM MEDIA REF795647","26.04","LEDGERBENCH DEMO LTD","53-19-28 27570744","acct-2026400001-3"
"03/09/2025","BP","BP GREENHOLM FOODS REF870023","-452.35","LEDGERBENCH DEMO LTD","53-19-28 27570744","acct-2026400001-3"
"05/09/2025","SO","SO LARKSPUR TRAVEL REF510785","-937.56","LEDGERBENCH DEMO LTD","53-19-28 27570744","acct-2026400001-3"
"05/09/2025","FPI","FPI OSPREY LEASING REF474746","5142.82","LEDGERBENCH DEMO LTD","53-19-28 27570744","acct-2026400001-3"
"06/09/2025","CR","CR KESTREL INSURANCE REF257944","4385.89","LEDGERBENCH DEMO LTD","53-19-28 27570744","acct-2026400001-3"
"09/09/2025","CR","CR MOORLAND TELECOM REF224576","11719.87","LEDGERBENCH DEMO LTD","53-19-28 27570744","acct-2026400001-3"
"13/09/2025","FPI","FPI FENWICK & PARTNERS REF657498","5350.39","LEDGERBENCH DEMO LTD","53-19-28 27570744","acct-2026400001-3"
"17/09/2025","CR","CR MOORLAND TELECOM REF376834","4899.20","LEDGERBENCH DEMO LTD","53-19-28 27570744","acct-2026400001-3"
"17/09/2025","BP","BP EASTFIELD ENERGY REF755428","-3502.23","LEDGERBENCH DEMO LTD","53-19-28 27570744","acct-2026400001-3"
"22/09/2025","FPO","FPO JUNIPER PAYROLL REF749252","-8521.78","LEDGERBENCH DEMO LTD","53-19-28 27570744","acct-2026400001-3"
"23/09/2025","TFR","TFR BRAMBLE LOGISTICS REF278179","13456.30","LEDGERBENCH DEMO LTD","53-19-28 27570744","acct-2026400001-3"
"23/09/2025","SO","SO LARKSPUR TRAVEL REF637893","-754.60","LEDGERBENCH DEMO LTD","53-19-28 27570744","acct-2026400001-3"
"24/09/2025","TFR","TFR MOORLAND TELECOM REF588743","4913.29","LEDGERBENCH DEMO LTD","53-19-28 27570744","acct-2026400001-3"
"25/09/2025","FPO","FPO FENWICK & PARTNERS REF211684","-5322.23","LEDGERBENCH DEMO LTD","53-19-28 27570744","acct-2026400001-3"
"25/09/2025","SO","SO KESTREL INSURANCE REF847935","-7584.20","LEDGERBENCH DEMO LTD","53-19-28 27570744","acct-2026400001-3"
"27/09/2025","FPO","FPO MOORLAND TELECOM REF484072","-2265.72","LEDGERBENCH DEMO LTD","53-19-28 27570744","acct-2026400001-3"
"27/09/2025","FPI","FPI NORTHGATE CLEANING REF961267","1761.81","LEDGERBENCH DEMO LTD","53-19-28 27570744","acct-2026400001-3"
"29/09/2025","BP","BP EASTFIELD ENERGY REF652945","-12805.85","LEDGERBENCH DEMO LTD","53-19-28 27570744","acct-2026400001-3"
"29/09/2025","CR","CR OSPREY LEASING REF766386","7512.15","LEDGERBENCH DEMO LTD","53-19-28 27570744","acct-2026400001-3"
"30/09/2025","CR","CR DELPHINIUM MEDIA REF970758","4504.42","LEDGERBENCH DEMO LTD","53-19-28 27570744","acct-2026400001-3"
 

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-2026400001-1£135,864.10
acct-2026400001-2£57,253.41
acct-2026400001-3£26,508.44

Recorded runs on this case

  • exactSingle prompt2 steps · 12,847 tokens · Confidence high

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

  • exactAgent with tools22 steps · 62,470 tokens · Confidence high

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

Step through any of these on the demo page.