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

Market risk: ASA residual risk add on (AS9 RRAO): the gross notional value of total residual risk add-on (OF91.09.01.01, Bank of England check boe_b0711)

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

The gross notional value of total residual risk add-on

In column "Gross notional value" (0010) of Market risk: ASA residual risk add on (AS9 RRAO) (OF91.09.01.01): "Total Residual Risk Add-on (RRAO)" (row 0010) must equal the sum of "Exotic underlyings" (row 0020), "Gap risk" (row 0030), "Correlation risk" (row 0040) and "Behavioural risk" (row 0050).

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  3. 03If they differ, a part is missing, a value sits in the wrong cell, or the total is out of date.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 OF91.09.01 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: ASA residual risk add on (AS9 RRAO) (OF91.09.01.01)

Rows

  • R0010Total Residual Risk Add-on (RRAO)
  • R0020Exotic underlyings
  • R0030Gap risk
  • R0040Correlation risk
  • R0050Behavioural risk

Column

  • C0010Gross notional value

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, r: 0010, c: 0010} = sum({t: OF91.09.01.01, r: 0020; 0030; 0040; 0050, c: 0010})

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.