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

Market risk: standardised approach for position risks in traded debt instruments (MKR SA TDI): a total must equal the sum of its parts (OF18.00.01.01, Bank of England check v0572_m)

A blocking check on the market risk: standardised approach for position risks in traded debt instruments (MKR SA TDI) template (OF18.00.01.01), 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 column "Own funds requirements" (0060) of Market risk: standardised approach for position risks in traded debt instruments (MKR SA TDI) (OF18.00.01.01): "Own funds requirement for non-securitisation debt instruments" (row 0251) must equal the sum of "Debt securities under the first category in Table 1" (row 0260), "Debt securities under the second category in Table 1" (row 0270), "Debt securities under the third category in Table 1" (row 0310), "Debt securities under the fourth category in Table 1" (row 0320) and "Rated nth-to default credit derivatives" (row 0321).

The headline gives only the template and the kind of check, because the rule is too long to say in a headline. The plain words above say all of it.

What to do if your return fails it

  1. 01Open the table 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  3. 03If they differ, a part is missing, a value sits in the wrong cell, or the total is out of date.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 OF18.00.01 as reported.
  6. 06This is a blocking check. A return that fails it is normally rejected, so fix it before you submit.

The cells it reads

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

Rows

  • R0251Own funds requirement for non-securitisation debt instruments
  • R0260Debt securities under the first category in Table 1
  • R0270Debt securities under the second category in Table 1
  • R0310Debt securities under the third category in Table 1
  • R0320Debt securities under the fourth category in Table 1
  • R0321Rated nth-to default credit derivatives

Column

  • C0060Own funds requirements

Sheets

  • S0001Total
  • S0002Euro
  • S0003Lek
  • S0004Bulgarian Lev
  • S0005Czech Koruna
  • S0006Danish Krone
  • S0007Pound Sterling
  • S0008Forint
  • S0009Yen
  • S0012Denar
  • S0013Zloty
  • S0014Romanian Leu
  • S0015Russian Ruble
  • S0016Serbian Dinar
  • S0017Swedish Krona
  • S0018Swiss Franc
  • S0019Turkish Lira
  • S0020Hryvnia
  • S0021US Dollar
  • S0022Iceland Krona
  • S0023Norwegian Krone
  • S0024Egyptian Pound
  • S0025Other
  • S0026Croatian Kuna

A worked example

With simple numbers.

Illustrative values
Debt securities under the first category in Table 11,200
Debt securities under the second category in Table 1800
Debt securities under the third category in Table 1450
Debt securities under the fourth category in Table 1300
Rated nth-to default credit derivatives150
Together2,900
What the rule then expects

Own funds requirement for non-securitisation debt instruments must then be 2,900.

2,900Passes
3,000Fails

A file that reports 2,900 passes. One that reports 3,000 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 blocking check.

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:

v0572_m: [OF18.00.01.01 (All sheets)] {r0251, c0060} = {r0260, c0060} + {r0270, c0060} + {r0310, c0060} + {r0320, c0060} + {r0321, c0060}
Show the formulaShow

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

{t: OF18.00.01.01, r: 0251, c: 0060} = {t: OF18.00.01.01, r: 0260, c: 0060} + {t: OF18.00.01.01, r: 0270, c: 0060} + {t: OF18.00.01.01, r: 0310, c: 0060} + {t: OF18.00.01.01, r: 0320, c: 0060} + {t: OF18.00.01.01, r: 0321, c: 0060}

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

scope({t: OF18.00.01.01, z:0001;0002;0003;0004;0005;0006;0007;0008;0009;0012;0013;0014;0015;0016;0017;0018;0019;0020;0021;0022;0023;0024;0025;0026, f: banking, fv: banking_reporting})

Every PRA banking rule on OF18.00.01.01

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.