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

Number of obligors check for Retail - Secured by residential immovable property non-SME (AIRB approach) (OF34.07.01.01, OF08.01.01.01, Bank of England check boe_b0848)

A blocking check on the counterparty credit risk: IRB approach - CCR exposures by exposure class and PD scale (CCR 7) (OF34.07.01.01) 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

Number of obligors check for Retail - Secured by residential immovable property non-SME (AIRB approach)

In Counterparty credit risk: IRB approach - CCR exposures by exposure class and PD scale (CCR 7) (OF34.07.01.01): "Total" in column "Number of obligors" (row 0180, column 0030) on sheet "Retail - Secured by residential immovable property non-SME (AIRB approach)" (sheet 0021) must equal the sum of "Securities Financing Transactions netting sets" (row 0040), "Derivatives & Long Settlement Transactions netting sets" (row 0050) and "From Contractual Cross Product netting sets" (row 0060) in column "Number of obligors" (column 0300) on sheet "Retail - Secured by residential immovable property non-SME (AIRB approach)" (sheet 0021) in Credit and counterparty credit risks and free deliveries: IRB approach to capital requirements (CR IRB 1) (OF08.01.01.01).

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  3. 03If they differ, a part is missing, a value sits in the wrong cell, or the total is out of date.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 OF34.07.01 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)

Rows

  • R0040Securities Financing Transactions netting sets
  • R0050Derivatives & Long Settlement Transactions netting sets
  • R0060From Contractual Cross Product netting sets

Column

  • C0300Number of obligors

Sheet

  • S0021Retail - Secured by residential immovable property non-SME (AIRB approach)

Counterparty credit risk: IRB approach - CCR exposures by exposure class and PD scale (CCR 7) (OF34.07.01.01)

Row

  • R0180Total

Column

  • C0030Number of obligors

Sheet

  • S0021Retail - Secured by residential immovable property non-SME (AIRB 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 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: OF34.07.01.01, r: 0180, c: 0030, z: 0021} = sum({t: OF08.01.01.01, r: 0040; 0050; 0060, c: 0300, z: 0021})

Every PRA banking rule on OF34.07.01.01

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.