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

Exposure after CRM substitution effects pre-conversion factors shall be consistent across templates for the relevant exposure class (OF08.06.01.01, OF08.01.01.01, Bank of England check boe_b0817)

A blocking check on the credit risk and free deliveries: IRB approach to capital requirements: specialised lending slotting approach (CR IRB 6) (OF08.06.01.01) and credit and counterparty credit risks and free deliveries: IRB approach to capital requirements (CR IRB 1) (OF08.01.01.01) templates, 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

Exposure after CRM substitution effects pre-conversion factors shall be consistent across templates for the relevant exposure class

In Credit risk and free deliveries: IRB approach to capital requirements: specialised lending slotting approach (CR IRB 6) (OF08.06.01.01): the sum of "Total" in column "Exposure after CRM substitution effects pre-conversion factors" (row 0095, column 0020) must equal the sum of "Specialised lending slotting approach: Total" in column "Exposure after CRM substitution effects pre-conversion factors" (row 0080, column 0090) on 2 sheets in Credit and counterparty credit risks and free deliveries: IRB approach to capital requirements (CR IRB 1) (OF08.01.01.01) divided by 2.

What to do if your return fails it

  1. 01Open the tables 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  3. 03If they differ, a part is missing, a value sits in the wrong cell, or the total is out of date.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 OF08.01.01 and 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 and counterparty credit risks and free deliveries: IRB approach to capital requirements (CR IRB 1) (OF08.01.01.01)

Row

  • R0080Specialised lending slotting approach: Total

Column

  • C0090Exposure after CRM substitution effects pre-conversion factors

Sheets

  • S0002Total (FIRB approach and slotting approach)
  • S0010Corporates - Specialised Lending (FIRB approach or slotting approach)

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

Row

  • R0095Total

Column

  • C0020Exposure after CRM substitution effects pre-conversion factors

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}.

sum({t: OF08.06.01.01, r: 0095, c: 0020}) = sum({t: OF08.01.01.01, r: 0080, c: 0090, z: 0002; 0010}) / 2

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.