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

MREL Debt: a conditional check (BR01.00.01.01, Bank of England check boe_b4101)

A blocking check on the MREL Debt template (BR01.00.01.01), in the MREL debt (MRL003) return.

Line4 Check runs it on the MREL debt (MRL003) return, proven on test files, check by check: the same outcome on all eight test files of that return.

Check your file for this ruleWhat to do if it fails

The rule in plain words

Column 060, 070 and 080 represent information about securities issued internally. If the instrument is issued externally, please enter 0 in column 080 and Not Applicable (with capitalised N and A) in column 060 and 070

In MREL Debt (BR01.00.01.01): if "External or Internal issuance" (column 050) is "Internal", exactly 3 values must be reported in "For internal issuances only: Name of the entity which holds the intra-group instrument" (column 060), "For internal issuances only: Identification of the entity which holds the intra-group instrument" (column 070) and "For internal issuances only: Amount of instrument held by the entity concerned" (column 080), and every value in "For internal issuances only: Amount of instrument held by the entity concerned" (column 080) must be zero or more.

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. 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 BR01.00.01 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

MREL Debt (BR01.00.01.01)

Columns

  • C050External or Internal issuance
  • C060For internal issuances only: Name of the entity which holds the intra-group instrument
  • C070For internal issuances only: Identification of the entity which holds the intra-group instrument
  • C080For internal issuances only: Amount of instrument held by the entity concerned

Which returns it applies to

Line4 Check runs it on the MREL debt (MRL003) return on Bank of England banking taxonomy 4.1.1. The Bank of England applies it to MREL debt (MRL003) 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}.

if {t: BR01.00.01.01, c: 050} = [boe_eba_TA:x8002] then count({t: BR01.00.01.01, c: 060; 070; 080}) = 3 and {t: BR01.00.01.01, c: 080} >=0 else true()

Every PRA banking rule on BR01.00.01.01

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.