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2 min readWarningBank of England banking taxonomy 4.1.1Updated 11 November 2026

"Total exposures" must equal the sum of "Originator: total exposures", "Investor: total exposures" and "Sponsor: total exposures" (OF19.00.01.01, OF18.00.01.01, Bank of England check v0583_m)

A warning on the market risk: standardised approach for specific risk in securitisations (MKR SA SEC) (OF19.00.01.01) and market risk: standardised approach for position risks in traded debt instruments (MKR SA TDI) (OF18.00.01.01) templates, in the own funds (PRA001) return.

Line4 Check runs it on the own funds (PRA001) return, proven on test files, check by check: the same outcome on all three test files of that return.

Check your file for this ruleWhat to do if it fails

The rule in plain words

In each of 49 columns (listed below) of Market risk: standardised approach for specific risk in securitisations (MKR SA SEC) (OF19.00.01.01): "Total exposures" (row 0010) must equal the sum of "Originator: total exposures" (row 0030), "Investor: total exposures" (row 0060) and "Sponsor: total exposures" (row 0090).

What to do if your return fails it

  1. 01Open the tables below and find the cells the rule reads.
  2. 02Add up the parts in your return and compare the result with the total.
  3. 03If they differ, a part is missing, a value sits in the wrong cell, or the total is out of date.
  4. 04The Bank of England allows a small rounding difference, worked out from the decimals each value is reported with.
  5. 05It runs only when your filing indicators mark OF19.00.01 as reported.
  6. 06This is a warning. It does not stop the return on its own, but your supervisor may ask you to explain it.

The cells it reads

Market risk: standardised approach for position risks in traded debt instruments (MKR SA TDI) (OF18.00.01.01)

Row

  • R0325Own funds requirement for securitisation instruments

Column

  • C0060Own funds requirements

Sheet

  • S0001Total

Market risk: standardised approach for specific risk in securitisations (MKR SA SEC) (OF19.00.01.01)

Rows

  • R0010Total exposures
  • R0030Originator: total exposures
  • R0060Investor: total exposures
  • R0090Sponsor: total exposures

Columns

  • C0010Long
  • C0020Short
  • C0030(-) Long
  • C0040(-) Short
  • C0050Long
  • C0060Short
  • C0061[0-10%[
  • C0062[10-12%[
  • C0063[12-20%[
  • C0064[20-40%[
  • C0065[40-100%[
  • C0066[100-150%[
  • C0071[150-200%[
  • C0072[200-225%[
  • C0073[225-250%[
  • C0074[250-300%[
  • C0075[300-350%[
  • C0076[350-425%[
  • C0077[425-500%[
  • C0078[500-650%[
  • C0079[650-750%[
  • C0081[750-850%[
  • C0082[850-1250%[
  • C00831250%
  • C0085[0-10%[
  • C0086[10-12%[
  • C0087[12-20%[
  • C0088[20-40%[
  • C0089[40-100%[
  • C0091[100-150%[
  • C0092[150-200%[
  • C0093[200-225%[
  • C0094[225-250%[
  • C0095[250-300%[
  • C0096[300-350%[
  • C0097[350-425%[
  • C0098[425-500%[
  • C0099[500-650%[
  • C0101[650-750%[
  • C0102[750-850%[

And 9 more.

A worked example

With simple numbers.

Illustrative values
Originator: total exposures1,200
Investor: total exposures800
Sponsor: total exposures450
Together2,450
What the rule then expects

Total exposures must then be 2,450.

2,450Passes
2,550Fails

A file that reports 2,450 passes. One that reports 2,550 fails, by 100.

The numbers are illustrative, reported to the unit, so the rounding tolerance does not change the result.

Which returns it applies to

Line4 Check runs it on the own funds (PRA001) return on Bank of England banking taxonomy 4.1.1. The Bank of England applies it to own funds (PRA001) returns, as a warning.

The Bank’s own words and formula

The plain words above spell out the Bank’s formula, with each cell named from its templates. In the Bank of England’s list of validations, word for word:

v0583_m: [OF19.00.01.01 (c0010;0020;0030;0040;0050;0060;0061;0062;0063;0064;0065;0066;0071;0072;0073;0074;0075;0076;0077;0078;0079;0081;0082;0083;0085;0086;0087;0088;0089;0091;0092;0093;0094;0095;0096;0097;0098;0099;0101;0102;0103;0104;0402;0403;0404;0405;0406;0570;0601)] {r0010} = {r0030} + {r0060} + {r0090}
Show the formulaShow

The Bank of England's formula. Cells are written as {t: table, r: row, c: column}.

{t: OF19.00.01.01, r: 0010} = {t: OF19.00.01.01, r: 0030} + {t: OF19.00.01.01, r: 0060} + {t: OF19.00.01.01, r: 0090}

Where it applies, in the Bank's words (its scope):

scope({t: OF19.00.01.01, c:0010;0020;0030;0040;0050;0060;0061;0062;0063;0064;0065;0066;0071;0072;0073;0074;0075;0076;0077;0078;0079;0081;0082;0083;0085;0086;0087;0088;0089;0091;0092;0093;0094;0095;0096;0097;0098;0099;0101;0102;0103;0104;0402;0403;0404;0405;0406;0570;0601, f: banking, fv: banking_reporting})

Every PRA banking rule on OF19.00.01.01

Checks like this one, run at the point of submission, are the first step to real-time supervision. Line4 builds SupTech software for financial regulators that runs checks like these as each return arrives.