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

Market risk: internal model approach 1A (MKR IMA1A): a value must not be more than another (OF24.01.01.01, OF700.00.01.01, Bank of England check boe_b0899)

A blocking check on the market risk: internal model approach 1A (MKR IMA1A) (OF24.01.01.01) and general information (OF700.00.01.01) 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

The end date used for the ES stress period shall not be beyond the general reporting period end date for this submission (stress period end date cannot be in the future)

In Market risk: internal model approach 1A (MKR IMA1A) (OF24.01.01.01): "Total positions" in column "End Period" (row 0010, column 0200) must not be more than "Reporting period end date" in column "Header info" (row 0050, column 0010) in General information (OF700.00.01.01).

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 tables 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. 03It runs only when your filing indicators mark OF24.01.01 and OF700.00.01 as reported.
  4. 04This is a blocking check. A return that fails it is normally rejected, so fix it before you submit.

The cells it reads

Market risk: internal model approach 1A (MKR IMA1A) (OF24.01.01.01)

Row

  • R0010Total positions

Column

  • C0200End Period

General information (OF700.00.01.01)

Row

  • R0050Reporting period end date

Column

  • C0010Header info

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: OF24.01.01.01, r: 0010, c: 0200} <= {t: OF700.00.01.01, r: 0050, c: 0010}

Every PRA banking rule on OF24.01.01.01

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.