1 min readWarningBank 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 value must not be negative (OF18.00.01.01, Bank of England check v7780_m)

A warning 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.

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 "Own funds requirement for securitisation instruments" (row 0325) and "Own funds requirement for the correlation trading portfolio" (row 0330) in column "Own funds requirements" (column 0060) on sheet "Total" (sheet 0001) must be zero or more.

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. 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 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)

Rows

  • R0325Own funds requirement for securitisation instruments
  • R0330Own funds requirement for the correlation trading portfolio

Column

  • C0060Own funds requirements

Sheet

  • S0001Total

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:

v7780_m: [OF18.00.01.01 (r0325;0330, s0001)] {c0060} >= 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: 0325; 0330, c: 0060, z: 0001} >= 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.