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

"Of which: calculated using the expert based approach" must not be more than "Model risk" (C32.02.01.01, Bank of England check v6355_m)

A blocking check on the prudent valuation: core approach - Pre and post diversification (PRUVAL 2) template (C32.02.01.01), 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 each of 12 rows (listed below) of Prudent valuation: core approach - Pre and post diversification (PRUVAL 2) (C32.02.01.01): "Of which: calculated using the expert based approach" (column 0060) must not be more than "Model risk" (column 0050).

What to do if your return fails it

  1. 01Open the table below and find the cells the rule reads.
  2. 02Compare the values in your return. If the first is bigger than it may be, one of them is wrong: check both before you change either.
  3. 03The Bank of England allows a small rounding difference, worked out from the decimals each value is reported with.
  4. 04It runs only when your filing indicators mark C32.02.01 as reported.
  5. 05This is a blocking check. A return that fails it is normally rejected, so fix it before you submit.

The cells it reads

Prudent valuation: core approach - Pre and post diversification (PRUVAL 2) (C32.02.01.01)

Rows

  • R0010Total core approach
  • R0020Of which: trading book
  • R0030Portfolios under articles 9 to 17 - total category level post-diversification
  • R0040Total category level pre-diversification
  • R0050Of which: unearned credit spreads AVA
  • R0060Of which: investment and funding costs AVA
  • R0090Interest rates
  • R0100Foreign exchange
  • R0110Credit
  • R0120Equities
  • R0130Commodities
  • R0170Memorandum item: pre-diversification AVAs reduced by more than 90% by diversification under method 2

Columns

  • C0050Model risk
  • C0060Of which: calculated using the expert based approach

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:

[v6355_m];[scope({t: C32.02.01.01, r:0010;0020;0030;0040;0050;0060;0090;0100;0110;0120;0130;0170})];[{t: C32.02.01.01, c: 0060} <= {t: C32.02.01.01, c: 0050}]
Show the formulaShow

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

{t: C32.02.01.01, c: 0060} <= {t: C32.02.01.01, c: 0050}

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

scope({t: C32.02.01.01, r:0010;0020;0030;0040;0050;0060;0090;0100;0110;0120;0130;0170, f: banking, fv: banking_reporting})

Every PRA banking rule on C32.02.01.01

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.