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date_ambiguity

date_ambiguity-2026150003

Some dates are swapped to an ambiguous convention.

expects date_ambiguity

Statement files

5 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-2026150003-2-2025-04-30</MsgId>
<CreDtTm>2025-04-30T23:59:00+00:00</CreDtTm>
</GrpHdr>
<Stmt>
<Id>acct-2026150003-2</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>GB40LBEN75795625347920</IBAN>
</Id>
<Ccy>GBP</Ccy>
</Acct>
<Bal>
<Tp>
<CdOrPrtry>
<Cd>OPBD</Cd>
</CdOrPrtry>
</Tp>
<Amt Ccy="GBP">159535.00</Amt>
<CdtDbtInd>CRDT</CdtDbtInd>
<Dt>
<Dt>2025-04-01</Dt>
</Dt>
</Bal>
<Ntry>
<Amt Ccy="GBP">9908.13</Amt>
<CdtDbtInd>CRDT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-04-01</Dt>
</BookgDt>
<ValDt>
<Dt>2025-04-01</Dt>
</ValDt>
<AcctSvcrRef>acct-2026150003-2-t015</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>FPI AURORA CONSULTING LTD REF585484</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">6599.30</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-04-01</Dt>
</BookgDt>
<ValDt>
<Dt>2025-04-01</Dt>
</ValDt>
<AcctSvcrRef>acct-2026150003-2-t017</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>BP BRAMBLE LOGISTICS REF277690</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">4306.72</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-04-02</Dt>
</BookgDt>
<ValDt>
<Dt>2025-04-02</Dt>
</ValDt>
<AcctSvcrRef>acct-2026150003-2-t007</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>BP OSPREY LEASING REF821232</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">2022.65</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-04-02</Dt>
</BookgDt>
<ValDt>
<Dt>2025-04-02</Dt>
</ValDt>
<AcctSvcrRef>acct-2026150003-2-t019</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>FPO IRONBRIDGE TOOLING REF671410</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">7923.81</Amt>
<CdtDbtInd>CRDT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-04-02</Dt>
</BookgDt>
<ValDt>
<Dt>2025-04-02</Dt>
</ValDt>
<AcctSvcrRef>acct-2026150003-2-t025</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>TFR NORTHGATE CLEANING REF974972</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">6546.30</Amt>
<CdtDbtInd>CRDT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-04-03</Dt>
</BookgDt>
<ValDt>
<Dt>2025-04-03</Dt>
</ValDt>
<AcctSvcrRef>acct-2026150003-2-t013</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>FPI BRAMBLE LOGISTICS REF350783</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">845.78</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-04-06</Dt>
</BookgDt>
<ValDt>
<Dt>2025-04-06</Dt>
</ValDt>
<AcctSvcrRef>acct-2026150003-2-t003</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>FPO OSPREY LEASING REF437214</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">5527.80</Amt>
<CdtDbtInd>CRDT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-04-06</Dt>
</BookgDt>
<ValDt>
<Dt>2025-04-06</Dt>
</ValDt>
<AcctSvcrRef>acct-2026150003-2-t024</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>CR KESTREL INSURANCE REF463635</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">1522.77</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-04-07</Dt>
</BookgDt>
<ValDt>
<Dt>2025-04-07</Dt>
</ValDt>
<AcctSvcrRef>acct-2026150003-2-t011</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>BP MOORLAND TELECOM REF204862</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">3648.79</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-04-08</Dt>
</BookgDt>
<ValDt>
<Dt>2025-04-08</Dt>
</ValDt>
<AcctSvcrRef>acct-2026150003-2-t028</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>FPO JUNIPER PAYROLL REF380794</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">5462.55</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-04-09</Dt>
</BookgDt>
<ValDt>
<Dt>2025-04-09</Dt>
</ValDt>
<AcctSvcrRef>acct-2026150003-2-t008</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>FPO BRAMBLE LOGISTICS REF676744</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">6367.71</Amt>
<CdtDbtInd>CRDT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-04-11</Dt>
</BookgDt>
<ValDt>
<Dt>2025-04-11</Dt>
</ValDt>
<AcctSvcrRef>acct-2026150003-2-t021</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>FPI KESTREL INSURANCE REF540889</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">14861.10</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-04-13</Dt>
</BookgDt>
<ValDt>
<Dt>2025-04-13</Dt>
</ValDt>
<AcctSvcrRef>acct-2026150003-2-t006</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>DD NORTHGATE CLEANING REF504603</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">5675.30</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-04-13</Dt>
</BookgDt>
<ValDt>
<Dt>2025-04-13</Dt>
</ValDt>
<AcctSvcrRef>acct-2026150003-2-t009</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>SO KESTREL INSURANCE REF631557</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">7681.50</Amt>
<CdtDbtInd>CRDT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-04-14</Dt>
</BookgDt>
<ValDt>
<Dt>2025-04-14</Dt>
</ValDt>
<AcctSvcrRef>acct-2026150003-2-t014</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>CR EASTFIELD ENERGY REF437409</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">5786.83</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-04-14</Dt>
</BookgDt>
<ValDt>
<Dt>2025-04-14</Dt>
</ValDt>
<AcctSvcrRef>acct-2026150003-2-t022</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>DD BRAMBLE LOGISTICS REF108498</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">9855.49</Amt>
<CdtDbtInd>CRDT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-04-15</Dt>
</BookgDt>
<ValDt>
<Dt>2025-04-15</Dt>
</ValDt>
<AcctSvcrRef>acct-2026150003-2-t001</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>CR MOORLAND TELECOM REF541204</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">1786.00</Amt>
<CdtDbtInd>CRDT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-04-15</Dt>
</BookgDt>
<ValDt>
<Dt>2025-04-15</Dt>
</ValDt>
<AcctSvcrRef>acct-2026150003-2-t026</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>CR LARKSPUR TRAVEL REF483671</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">3320.18</Amt>
<CdtDbtInd>CRDT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-04-17</Dt>
</BookgDt>
<ValDt>
<Dt>2025-04-17</Dt>
</ValDt>
<AcctSvcrRef>acct-2026150003-2-t023</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>TFR BRAMBLE LOGISTICS REF427196</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">5899.14</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-04-22</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: 29-15-81 52324001
Account reference: acct-2026150003-1
Statement period: 01 Apr 2025 to 30 Apr 2025
Currency: GBP
Opening balance: 100160.22
Date Payment type Details Paid out Paid in
02 Apr 2025 SO GREENHOLM FOODS REF898359 2938.82
03 Apr 2025 FPI AURORA CONSULTING LTD REF707334 12546.79
03 Apr 2025 SO EASTFIELD ENERGY REF326951 4248.44
06 Apr 2025 BP JUNIPER PAYROLL REF957291 4050.59
06 Apr 2025 SO FENWICK & PARTNERS REF885218 11555.36
07 Apr 2025 FPO FENWICK & PARTNERS REF633206 5434.96
08 Apr 2025 FPI FENWICK & PARTNERS REF109914 1364.57
09 Apr 2025 CR HARBOURLIGHT IT REF373455 10838.36
10 Apr 2025 SO HARBOURLIGHT IT REF340330 2333.91
10 Apr 2025 TFR NORTHGATE CLEANING REF175046 11878.41
11 Apr 2025 DD AURORA CONSULTING LTD REF853219 11174.74
11 Apr 2025 SO LARKSPUR TRAVEL REF898379 11449.82
16 Apr 2025 FPO AURORA CONSULTING LTD REF215957 3663.64
16 Apr 2025 SO DELPHINIUM MEDIA REF744320 1667.30
17 Apr 2025 FPO MOORLAND TELECOM REF547659 3189.57
17 Apr 2025 BP LARKSPUR TRAVEL REF630792 10193.52
18 Apr 2025 DD LARKSPUR TRAVEL REF637775 2954.79
18 Apr 2025 BP OSPREY LEASING REF408608 8294.90
18 Apr 2025 SO EASTFIELD ENERGY REF755114 10032.93
18 Apr 2025 SO CASTLEGATE PROPERTY REF693065 8942.32
19 Apr 2025 SO HARBOURLIGHT IT REF924815 4639.16
21 Apr 2025 TFR AURORA CONSULTING LTD REF436570 3460.65
22 Apr 2025 FPI DELPHINIUM MEDIA REF880351 9040.76
23 Apr 2025 TFR NORTHGATE CLEANING REF557159 14305.71
24 Apr 2025 SO LARKSPUR TRAVEL REF100342 4355.37
26 Apr 2025 BP FENWICK & PARTNERS REF308591 9970.49
26 Apr 2025 SO IRONBRIDGE TOOLING REF821413 6790.85
27 Apr 2025 TFR IRONBRIDGE TOOLING REF141673 3964.88
29 Apr 2025 SO MOORLAND TELECOM REF521892 12623.19
29 Apr 2025 DD EASTFIELD ENERGY REF882632 1993.76
rbs_transactions.csv5 changed lines · first at line 2
"Date","Type","Description","Value","Account Name","Account Number","Ledger Ref"
"04/01/2025","BAL","OPENING BALANCE","19214.41","LEDGERBENCH DEMO LTD","41-30-39 75222443","acct-2026150003-3"
"04/01/2025","DD","DD LARKSPUR TRAVEL REF544912","-14714.39","LEDGERBENCH DEMO LTD","41-30-39 75222443","acct-2026150003-3"
"02/04/2025","FPO","FPO EASTFIELD ENERGY REF444967","-9315.10","LEDGERBENCH DEMO LTD","41-30-39 75222443","acct-2026150003-3"
"02/04/2025","SO","SO DELPHINIUM MEDIA REF293883","-14645.23","LEDGERBENCH DEMO LTD","41-30-39 75222443","acct-2026150003-3"
"04/04/2025","TFR","TFR GREENHOLM FOODS REF231073","8899.85","LEDGERBENCH DEMO LTD","41-30-39 75222443","acct-2026150003-3"
"04/05/2025","SO","SO GREENHOLM FOODS REF179835","-3297.83","LEDGERBENCH DEMO LTD","41-30-39 75222443","acct-2026150003-3"
"05/04/2025","CR","CR HARBOURLIGHT IT REF912849","8521.90","LEDGERBENCH DEMO LTD","41-30-39 75222443","acct-2026150003-3"
"04/07/2025","SO","SO AURORA CONSULTING LTD REF324846","-1618.86","LEDGERBENCH DEMO LTD","41-30-39 75222443","acct-2026150003-3"
"04/07/2025","SO","SO GREENHOLM FOODS REF652173","-5380.73","LEDGERBENCH DEMO LTD","41-30-39 75222443","acct-2026150003-3"
"09/04/2025","FPO","FPO KESTREL INSURANCE REF474846","-6502.14","LEDGERBENCH DEMO LTD","41-30-39 75222443","acct-2026150003-3"
"11/04/2025","DD","DD DELPHINIUM MEDIA REF248779","-4941.07","LEDGERBENCH DEMO LTD","41-30-39 75222443","acct-2026150003-3"
"12/04/2025","TFR","TFR LARKSPUR TRAVEL REF433401","527.50","LEDGERBENCH DEMO LTD","41-30-39 75222443","acct-2026150003-3"
"13/04/2025","CR","CR NORTHGATE CLEANING REF572691","14826.84","LEDGERBENCH DEMO LTD","41-30-39 75222443","acct-2026150003-3"
"14/04/2025","SO","SO FENWICK & PARTNERS REF259123","-4497.23","LEDGERBENCH DEMO LTD","41-30-39 75222443","acct-2026150003-3"
"16/04/2025","CR","CR IRONBRIDGE TOOLING REF366408","8636.64","LEDGERBENCH DEMO LTD","41-30-39 75222443","acct-2026150003-3"
"16/04/2025","BP","BP LARKSPUR TRAVEL REF979183","-2443.95","LEDGERBENCH DEMO LTD","41-30-39 75222443","acct-2026150003-3"
"16/04/2025","DD","DD CASTLEGATE PROPERTY REF772708","-6091.78","LEDGERBENCH DEMO LTD","41-30-39 75222443","acct-2026150003-3"
"18/04/2025","SO","SO LARKSPUR TRAVEL REF321871","-4379.04","LEDGERBENCH DEMO LTD","41-30-39 75222443","acct-2026150003-3"
"19/04/2025","BP","BP EASTFIELD ENERGY REF435951","-13772.55","LEDGERBENCH DEMO LTD","41-30-39 75222443","acct-2026150003-3"
"21/04/2025","BP","BP FENWICK & PARTNERS REF272054","-10772.47","LEDGERBENCH DEMO LTD","41-30-39 75222443","acct-2026150003-3"
"21/04/2025","SO","SO BRAMBLE LOGISTICS REF585197","-200.68","LEDGERBENCH DEMO LTD","41-30-39 75222443","acct-2026150003-3"
"22/04/2025","BP","BP GREENHOLM FOODS REF502820","-5495.77","LEDGERBENCH DEMO LTD","41-30-39 75222443","acct-2026150003-3"
"22/04/2025","FPO","FPO JUNIPER PAYROLL REF471319","-7138.68","LEDGERBENCH DEMO LTD","41-30-39 75222443","acct-2026150003-3"
"22/04/2025","SO","SO KESTREL INSURANCE REF814958","-4100.60","LEDGERBENCH DEMO LTD","41-30-39 75222443","acct-2026150003-3"
"23/04/2025","DD","DD OSPREY LEASING REF877254","-947.05","LEDGERBENCH DEMO LTD","41-30-39 75222443","acct-2026150003-3"
"27/04/2025","CR","CR BRAMBLE LOGISTICS REF376618","11368.49","LEDGERBENCH DEMO LTD","41-30-39 75222443","acct-2026150003-3"
"27/04/2025","SO","SO LARKSPUR TRAVEL REF386383","-7073.79","LEDGERBENCH DEMO LTD","41-30-39 75222443","acct-2026150003-3"
"27/04/2025","CR","CR HARBOURLIGHT IT REF657589","1660.71","LEDGERBENCH DEMO LTD","41-30-39 75222443","acct-2026150003-3"
"30/04/2025","BP","BP GREENHOLM FOODS REF413910","-5190.15","LEDGERBENCH DEMO LTD","41-30-39 75222443","acct-2026150003-3"
"30/04/2025","FPO","FPO MOORLAND TELECOM REF701383","-7031.22","LEDGERBENCH DEMO LTD","41-30-39 75222443","acct-2026150003-3"
"30/04/2025","CR","CR LARKSPUR TRAVEL REF846202","3299.87","LEDGERBENCH DEMO LTD","41-30-39 75222443","acct-2026150003-3"
"30/04/2025","DD","DD GREENHOLM FOODS REF183822","-7226.46","LEDGERBENCH DEMO LTD","41-30-39 75222443","acct-2026150003-3"
 

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-2026150003-1£25,061.92
acct-2026150003-2£122,124.14
acct-2026150003-3−£69,820.56

Recorded runs on this case

  • exactSingle prompt2 steps · 14,295 tokens · Confidence medium

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

  • exactAgent with tools17 steps · 36,552 tokens · Confidence high

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

Step through any of these on the demo page.