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

Every value in "Traded debt instruments in trading book" in column "Total risk exposure amount" on 24 sheets must be zero or more (OF18.00.01.01, OF02.00.01.01, Bank of England check v3763_s)

A blocking check on the market risk: standardised approach for position risks in traded debt instruments (MKR SA TDI) (OF18.00.01.01) and own funds requirements (CA2) (OF02.00.01.01) 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.

The rule in plain words

In Market risk: standardised approach for position risks in traded debt instruments (MKR SA TDI) (OF18.00.01.01): every value in "Traded debt instruments in trading book" in column "Total risk exposure amount" (row 0010, column 0070) on 24 sheets must be zero or more.

What to do if your return fails it

  1. 01Open the tables below and find the cells the rule reads.
  2. 02Look for a value below zero in these cells, such as an amount entered as a negative number.
  3. 03It runs only when your filing indicators mark OF18.00.01 as reported.
  4. 04This is a blocking check. A return that fails it is normally rejected, so fix it before you submit.

The cells it reads

Own funds requirements (CA2) (OF02.00.01.01)

Row

  • R0540Traded debt instruments

Column

  • C0010All approaches

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

Row

  • R0010Traded debt instruments in trading book

Column

  • C0070Total risk exposure amount

Sheets

  • 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

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:

v3763_s: [OF18.00.01.01 (r0010, c0070, All sheets)] >= 0
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: 0010, c: 0070, 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} >= 0

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.