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

Market risk: ASA residual risk add on (AS9 RRAO): own funds requirement for other residual underlying (OF91.09.01.01, Bank of England check boe_b0550)

A blocking check on the market risk: ASA residual risk add on (AS9 RRAO) template (OF91.09.01.01), 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

Own funds requirement for other residual underlying

In each of "Gap risk" (row 0030), "Correlation risk" (row 0040) and "Behavioural risk" (row 0050) of Market risk: ASA residual risk add on (AS9 RRAO) (OF91.09.01.01): "Own funds requirements" (column 0020) must equal "Gross notional value" (column 0010) multiplied by 0.001.

This is a blocking check. A return that fails it is normally rejected, so fix it before you submit. It runs only when your filing indicators mark OF91.09.01 as reported.

The cells it reads

Market risk: ASA residual risk add on (AS9 RRAO) (OF91.09.01.01)

Rows

  • R0030Gap risk
  • R0040Correlation risk
  • R0050Behavioural risk

Columns

  • C0010Gross notional value
  • C0020Own funds requirements

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 first paragraph of the plain words above is the Bank of England’s own, word for word, from its list of validations. The second spells out its formula, with each cell named from its templates.

Show the formulaShow

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

{t: OF91.09.01.01, c: 0020} = {t: OF91.09.01.01, c: 0010} * 0.001

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

scope({t: OF91.09.01.01, r:0030;0040;0050, f: banking, fv: banking_reporting})

Every PRA banking rule on OF91.09.01.01

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.