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date_ambiguity

date_ambiguity-2026150001

Some dates are swapped to an ambiguous convention.

expects date_ambiguity

Statement files

3 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-2026150001-2-2025-12-31</MsgId>
<CreDtTm>2025-12-31T23:59:00+00:00</CreDtTm>
</GrpHdr>
<Stmt>
<Id>acct-2026150001-2</Id>
<ElctrncSeqNb>1</ElctrncSeqNb>
<CreDtTm>2025-12-31T23:59:00+00:00</CreDtTm>
<FrToDt>
<FrDtTm>2025-12-01T00:00:00+00:00</FrDtTm>
<ToDtTm>2025-12-31T23:59:59+00:00</ToDtTm>
</FrToDt>
<Acct>
<Id>
<IBAN>GB65LBEN65385421717693</IBAN>
</Id>
<Ccy>GBP</Ccy>
</Acct>
<Bal>
<Tp>
<CdOrPrtry>
<Cd>OPBD</Cd>
</CdOrPrtry>
</Tp>
<Amt Ccy="GBP">128126.53</Amt>
<CdtDbtInd>CRDT</CdtDbtInd>
<Dt>
<Dt>2025-12-01</Dt>
</Dt>
</Bal>
<Ntry>
<Amt Ccy="GBP">5525.43</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-12-02</Dt>
</BookgDt>
<ValDt>
<Dt>2025-12-02</Dt>
</ValDt>
<AcctSvcrRef>acct-2026150001-2-t013</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>BP EASTFIELD ENERGY REF236885</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">13596.74</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-12-02</Dt>
</BookgDt>
<ValDt>
<Dt>2025-12-02</Dt>
</ValDt>
<AcctSvcrRef>acct-2026150001-2-t019</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>DD OSPREY LEASING REF279883</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">13653.51</Amt>
<CdtDbtInd>CRDT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-12-03</Dt>
</BookgDt>
<ValDt>
<Dt>2025-12-03</Dt>
</ValDt>
<AcctSvcrRef>acct-2026150001-2-t011</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>CR IRONBRIDGE TOOLING REF830335</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">3852.56</Amt>
<CdtDbtInd>CRDT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-12-03</Dt>
</BookgDt>
<ValDt>
<Dt>2025-12-03</Dt>
</ValDt>
<AcctSvcrRef>acct-2026150001-2-t014</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>CR FENWICK &amp; PARTNERS REF162622</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">12613.87</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-12-04</Dt>
</BookgDt>
<ValDt>
<Dt>2025-12-04</Dt>
</ValDt>
<AcctSvcrRef>acct-2026150001-2-t015</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>DD JUNIPER PAYROLL REF319540</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">4642.38</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-12-04</Dt>
</BookgDt>
<ValDt>
<Dt>2025-12-04</Dt>
</ValDt>
<AcctSvcrRef>acct-2026150001-2-t018</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>SO LARKSPUR TRAVEL REF388523</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">13979.36</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-12-05</Dt>
</BookgDt>
<ValDt>
<Dt>2025-12-05</Dt>
</ValDt>
<AcctSvcrRef>acct-2026150001-2-t001</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>DD MOORLAND TELECOM REF476944</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">8731.99</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-12-06</Dt>
</BookgDt>
<ValDt>
<Dt>2025-12-06</Dt>
</ValDt>
<AcctSvcrRef>acct-2026150001-2-t008</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>BP LARKSPUR TRAVEL REF414686</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">2187.51</Amt>
<CdtDbtInd>CRDT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-12-08</Dt>
</BookgDt>
<ValDt>
<Dt>2025-12-08</Dt>
</ValDt>
<AcctSvcrRef>acct-2026150001-2-t007</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>TFR NORTHGATE CLEANING REF936227</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">96.47</Amt>
<CdtDbtInd>CRDT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-12-13</Dt>
</BookgDt>
<ValDt>
<Dt>2025-12-13</Dt>
</ValDt>
<AcctSvcrRef>acct-2026150001-2-t017</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>CR EASTFIELD ENERGY REF773687</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">6067.88</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-12-14</Dt>
</BookgDt>
<ValDt>
<Dt>2025-12-14</Dt>
</ValDt>
<AcctSvcrRef>acct-2026150001-2-t004</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>DD HARBOURLIGHT IT REF287099</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">9201.94</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-12-14</Dt>
</BookgDt>
<ValDt>
<Dt>2025-12-14</Dt>
</ValDt>
<AcctSvcrRef>acct-2026150001-2-t006</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>BP GREENHOLM FOODS REF569764</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">4462.70</Amt>
<CdtDbtInd>CRDT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-12-15</Dt>
</BookgDt>
<ValDt>
<Dt>2025-12-15</Dt>
</ValDt>
<AcctSvcrRef>acct-2026150001-2-t021</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>FPI GREENHOLM FOODS REF301297</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">9848.18</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-12-19</Dt>
</BookgDt>
<ValDt>
<Dt>2025-12-19</Dt>
</ValDt>
<AcctSvcrRef>acct-2026150001-2-t010</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>SO EASTFIELD ENERGY REF484085</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">8252.41</Amt>
<CdtDbtInd>CRDT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-12-23</Dt>
</BookgDt>
<ValDt>
<Dt>2025-12-23</Dt>
</ValDt>
<AcctSvcrRef>acct-2026150001-2-t003</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>CR IRONBRIDGE TOOLING REF349551</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">10709.38</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-12-23</Dt>
</BookgDt>
<ValDt>
<Dt>2025-12-23</Dt>
</ValDt>
<AcctSvcrRef>acct-2026150001-2-t005</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>SO EASTFIELD ENERGY REF149326</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">3929.35</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-12-27</Dt>
</BookgDt>
<ValDt>
<Dt>2025-12-27</Dt>
</ValDt>
<AcctSvcrRef>acct-2026150001-2-t016</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>DD LARKSPUR TRAVEL REF102818</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">9468.62</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-12-27</Dt>
</BookgDt>
<ValDt>
<Dt>2025-12-27</Dt>
</ValDt>
<AcctSvcrRef>acct-2026150001-2-t020</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>DD GREENHOLM FOODS REF557927</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">8984.29</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-12-28</Dt>
</BookgDt>
<ValDt>
<Dt>2025-12-28</Dt>
</ValDt>
<AcctSvcrRef>acct-2026150001-2-t009</AcctSvcrRef>
<NtryDtls>
<TxDtls>
<RmtInf>
<Ustrd>DD MOORLAND TELECOM REF147166</Ustrd>
</RmtInf>
</TxDtls>
</NtryDtls>
</Ntry>
<Ntry>
<Amt Ccy="GBP">5503.09</Amt>
<CdtDbtInd>DBIT</CdtDbtInd>
<Sts>BOOK</Sts>
<BookgDt>
<Dt>2025-12-30</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: 16-41-78 99882683
Account reference: acct-2026150001-1
Statement period: 01 Dec 2025 to 31 Dec 2025
Currency: GBP
Opening balance: 185407.24
Date Payment type Details Paid out Paid in
02 Dec 2025 TFR FENWICK & PARTNERS REF979244 2624.10
02 Dec 2025 TFR BRAMBLE LOGISTICS REF147210 4286.19
04 Dec 2025 SO DELPHINIUM MEDIA REF287569 8649.13
04 Dec 2025 CR KESTREL INSURANCE REF782891 14416.93
04 Dec 2025 FPO GREENHOLM FOODS REF837560 1867.12
04 Dec 2025 TFR BRAMBLE LOGISTICS REF979416 9651.15
06 Dec 2025 FPI IRONBRIDGE TOOLING REF118440 9713.63
07 Dec 2025 BP FENWICK & PARTNERS REF690828 3064.83
09 Dec 2025 FPI EASTFIELD ENERGY REF434070 1323.50
10 Dec 2025 DD EASTFIELD ENERGY REF603882 14130.26
11 Dec 2025 BP IRONBRIDGE TOOLING REF220740 3103.79
13 Dec 2025 FPI MOORLAND TELECOM REF168065 5977.29
14 Dec 2025 CR DELPHINIUM MEDIA REF702688 1530.18
15 Dec 2025 CR NORTHGATE CLEANING REF544189 9823.94
17 Dec 2025 DD FENWICK & PARTNERS REF571217 2873.77
18 Dec 2025 BP GREENHOLM FOODS REF837231 6946.34
19 Dec 2025 TFR MOORLAND TELECOM REF643811 5735.40
19 Dec 2025 FPI OSPREY LEASING REF216756 2845.38
22 Dec 2025 FPO LARKSPUR TRAVEL REF518850 3860.88
22 Dec 2025 BP NORTHGATE CLEANING REF742711 5727.31
26 Dec 2025 FPO FENWICK & PARTNERS REF563296 14256.52
28 Dec 2025 DD BRAMBLE LOGISTICS REF903040 415.43
30 Dec 2025 SO LARKSPUR TRAVEL REF896095 9821.25
31 Dec 2025 DD CASTLEGATE PROPERTY REF183924 5836.01
31 Dec 2025 SO HARBOURLIGHT IT REF341962 6441.31
rbs_transactions.csv3 changed lines · first at line 3
"Date","Type","Description","Value","Account Name","Account Number","Ledger Ref"
"01/12/2025","BAL","OPENING BALANCE","85198.23","LEDGERBENCH DEMO LTD","32-37-56 68302797","acct-2026150001-3"
"12/01/2025","FPI","FPI EASTFIELD ENERGY REF715020","2432.49","LEDGERBENCH DEMO LTD","32-37-56 68302797","acct-2026150001-3"
"12/01/2025","CR","CR BRAMBLE LOGISTICS REF750594","8319.45","LEDGERBENCH DEMO LTD","32-37-56 68302797","acct-2026150001-3"
"12/03/2025","FPI","FPI EASTFIELD ENERGY REF513822","2580.80","LEDGERBENCH DEMO LTD","32-37-56 68302797","acct-2026150001-3"
"08/12/2025","DD","DD LARKSPUR TRAVEL REF573963","-906.63","LEDGERBENCH DEMO LTD","32-37-56 68302797","acct-2026150001-3"
"09/12/2025","FPI","FPI CASTLEGATE PROPERTY REF685367","2491.28","LEDGERBENCH DEMO LTD","32-37-56 68302797","acct-2026150001-3"
"10/12/2025","BP","BP BRAMBLE LOGISTICS REF742760","-8882.90","LEDGERBENCH DEMO LTD","32-37-56 68302797","acct-2026150001-3"
"13/12/2025","FPO","FPO JUNIPER PAYROLL REF199673","-10673.14","LEDGERBENCH DEMO LTD","32-37-56 68302797","acct-2026150001-3"
"13/12/2025","FPI","FPI HARBOURLIGHT IT REF103265","279.53","LEDGERBENCH DEMO LTD","32-37-56 68302797","acct-2026150001-3"
"13/12/2025","CR","CR BRAMBLE LOGISTICS REF538326","6687.15","LEDGERBENCH DEMO LTD","32-37-56 68302797","acct-2026150001-3"
"15/12/2025","TFR","TFR EASTFIELD ENERGY REF705519","2457.38","LEDGERBENCH DEMO LTD","32-37-56 68302797","acct-2026150001-3"
"15/12/2025","FPI","FPI CASTLEGATE PROPERTY REF933952","8912.23","LEDGERBENCH DEMO LTD","32-37-56 68302797","acct-2026150001-3"
"17/12/2025","FPI","FPI NORTHGATE CLEANING REF168973","1612.86","LEDGERBENCH DEMO LTD","32-37-56 68302797","acct-2026150001-3"
"17/12/2025","TFR","TFR JUNIPER PAYROLL REF761008","6511.58","LEDGERBENCH DEMO LTD","32-37-56 68302797","acct-2026150001-3"
"18/12/2025","SO","SO JUNIPER PAYROLL REF183100","-1469.82","LEDGERBENCH DEMO LTD","32-37-56 68302797","acct-2026150001-3"
"19/12/2025","CR","CR NORTHGATE CLEANING REF777149","13466.07","LEDGERBENCH DEMO LTD","32-37-56 68302797","acct-2026150001-3"
"19/12/2025","DD","DD AURORA CONSULTING LTD REF588798","-1575.83","LEDGERBENCH DEMO LTD","32-37-56 68302797","acct-2026150001-3"
"19/12/2025","SO","SO GREENHOLM FOODS REF160558","-12549.61","LEDGERBENCH DEMO LTD","32-37-56 68302797","acct-2026150001-3"
"19/12/2025","BP","BP KESTREL INSURANCE REF711306","-11039.96","LEDGERBENCH DEMO LTD","32-37-56 68302797","acct-2026150001-3"
"19/12/2025","DD","DD DELPHINIUM MEDIA REF975180","-9753.27","LEDGERBENCH DEMO LTD","32-37-56 68302797","acct-2026150001-3"
"20/12/2025","CR","CR AURORA CONSULTING LTD REF511178","205.33","LEDGERBENCH DEMO LTD","32-37-56 68302797","acct-2026150001-3"
"20/12/2025","BP","BP OSPREY LEASING REF485146","-13442.57","LEDGERBENCH DEMO LTD","32-37-56 68302797","acct-2026150001-3"
"21/12/2025","FPO","FPO FENWICK & PARTNERS REF655969","-3289.37","LEDGERBENCH DEMO LTD","32-37-56 68302797","acct-2026150001-3"
"22/12/2025","CR","CR LARKSPUR TRAVEL REF261374","10812.22","LEDGERBENCH DEMO LTD","32-37-56 68302797","acct-2026150001-3"
"23/12/2025","CR","CR HARBOURLIGHT IT REF409299","4823.56","LEDGERBENCH DEMO LTD","32-37-56 68302797","acct-2026150001-3"
"25/12/2025","CR","CR JUNIPER PAYROLL REF722800","459.64","LEDGERBENCH DEMO LTD","32-37-56 68302797","acct-2026150001-3"
"26/12/2025","TFR","TFR FENWICK & PARTNERS REF816250","9718.85","LEDGERBENCH DEMO LTD","32-37-56 68302797","acct-2026150001-3"
"26/12/2025","BP","BP EASTFIELD ENERGY REF954076","-446.33","LEDGERBENCH DEMO LTD","32-37-56 68302797","acct-2026150001-3"
"28/12/2025","TFR","TFR GREENHOLM FOODS REF607532","12344.15","LEDGERBENCH DEMO LTD","32-37-56 68302797","acct-2026150001-3"
"29/12/2025","FPI","FPI OSPREY LEASING REF882120","14242.34","LEDGERBENCH DEMO LTD","32-37-56 68302797","acct-2026150001-3"
"29/12/2025","SO","SO OSPREY LEASING REF654258","-6310.09","LEDGERBENCH DEMO LTD","32-37-56 68302797","acct-2026150001-3"
"31/12/2025","SO","SO DELPHINIUM MEDIA REF864863","-13364.91","LEDGERBENCH DEMO LTD","32-37-56 68302797","acct-2026150001-3"
 

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-2026150001-1£166,340.98
acct-2026150001-2£36,229.61
acct-2026150001-3£99,850.71

Recorded runs on this case

  • exactSingle prompt2 steps · 10,864 tokens · Confidence medium

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

  • exactAgent with tools20 steps · 43,927 tokens · Confidence high

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

Step through any of these on the demo page.