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1 min readWarningBank of England taxonomy 2.2.0Updated 11 November 2026

Cyber underwriting risk: if Product Group Code (C0010) is reported then Line(s) of business (C0050) should be reported (IR.21.04, Bank of England rule IR_bv3024_01)

A warning on the cyber underwriting risk template (IR.21.04), in the annual solo (ARS) and annual third-country branch (ARB) returns.

Check your file for this ruleWhat to do if it fails

The rule in plain words

If Product Group Code (C0010) is reported then Line(s) of business (C0050) should be reported

What to do if your return fails it

  1. 01Open the table below and find the cells the rule reads.
  2. 02The check applies only when its first part holds in your return. When it does, the second part must hold too: fix the second part, or correct the first.
  3. 03It runs only when your filing indicators mark IR.21.04 as reported.
  4. 04This is a warning. It does not stop the return on its own, but your supervisor may ask you to explain it.

The cells it reads

Cyber underwriting risk - risk identification (IR.21.04.01.01)

Columns

  • C0010Product Group Code
  • C0050Line(s) of business

Which returns it applies to

Line4 Check runs it on annual solo (ARS) and annual third-country branch (ARB) returns on Bank of England taxonomy 2.2.0. The Bank of England applies it to annual solo (ARS) and annual third-country branch (ARB) returns, as a warning.

The Bank’s own words and formula

The plain words above are the Bank of England’s own, word for word, from its list of validations.

Show the formulaShow

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

if count({t: IR.21.04.01.01, c: C0010}) = 1 then count({t: IR.21.04.01.01, c: C0050}) = 1 else true()

Every Solvency UK rule on IR.21.04

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.