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

Credit risk and free deliveries: IRB approach to capital requirements: specialised lending slotting approach (CR IRB 6): a total must equal the sum of its parts (OF08.06.01.01, Bank of England check boe_b1042)

A blocking check on the credit risk and free deliveries: IRB approach to capital requirements: specialised lending slotting approach (CR IRB 6) template (OF08.06.01.01), 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

to ensure that exposure value is equal to exposure after CRM substitution effects pre-conversion factors minus change in exposure due to FCCM

In each of 10 rows (listed below) of Credit risk and free deliveries: IRB approach to capital requirements: specialised lending slotting approach (CR IRB 6) (OF08.06.01.01): "Exposure value" (column 0040) must equal the sum of "Exposure after CRM substitution effects pre-conversion factors" (column 0020) and "(-) Change in exposure due to FCCM" (column 0031).

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. 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  3. 03If they differ, a part is missing, a value sits in the wrong cell, or the total is out of date.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 OF08.06.01 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

Credit risk and free deliveries: IRB approach to capital requirements: specialised lending slotting approach (CR IRB 6) (OF08.06.01.01)

Rows

  • R0005Preferential
  • R0015Of which: substantially stronger
  • R0025Of which: less than 2.5 years remaining until maturity
  • R0035Other
  • R0045Less than 2.5 years remaining until maturity
  • R0055Other
  • R0065Satisfactory
  • R0075Weak
  • R0085Default
  • R0095Total

Columns

  • C0020Exposure after CRM substitution effects pre-conversion factors
  • C0031(-) Change in exposure due to FCCM
  • C0040Exposure 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: OF08.06.01.01, c: 0040} = sum({t: OF08.06.01.01, c: 0020; 0031})

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

scope({t: OF08.06.01.01, r:0005;0015;0025;0035;0045;0055;0065;0075;0085;0095, f: banking, fv: banking_reporting})

Every PRA banking rule on OF08.06.01.01

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.