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1 min readWarningEBA reporting framework 4.2Updated 10 November 2026

Maximum single loss (under total business lines) must equal the largest of nine values (EBA rule v5839_m)

A warning in the own funds and capital requirements return (COREP own funds), on template C 17.01.a, operational risk: losses and recoveries by business lines and event types in the last year.

Check your file against this ruleWhat to do if it fails

The rule in plain words

Maximum single loss (under total business lines) must equal the largest of nine values.

EBA checks it for seven columns: internal fraud, external fraud, employment practices and workplace safety, clients, products & business practices, damage to physical assets, business disruption and system failures, and execution, delivery & process management. That makes seven checks. A failure names the one that failed.

How the Line4 Check report words itShow

The first of its checks, word for word as the report shows it when it fails. The others read the same, with their own column, row or sheet.

INTERNAL FRAUD: TOTAL BUSINESS LINES, maximum single loss = the largest of CORPORATE FINANCE [CF], maximum single loss, TRADING AND SALES [TS], maximum single loss, RETAIL BROKERAGE [RBr], maximum single loss, COMMERCIAL BANKING [CB], maximum single loss, RETAIL BANKING [RB], maximum single loss, PAYMENT AND SETTLEMENT [PS], maximum single loss, AGENCY SERVICES [AS], maximum single loss, ASSET MANAGEMENT [AM], maximum single loss and CORPORATE ITEMS [CI], maximum single loss

What to do if your filing fails it

  1. 01Open the template below and find the cells the rule reads.
  2. 02Work out both sides from your file, as the rule in plain words sets out, and compare them.
  3. 03EBA allows a small rounding difference, worked out from the decimals each value is reported with.
  4. 04It runs only when your filing indicators mark C 17.01 as reported.
  5. 05This is a warning. It does not stop the filing on its own, but your authority may ask you to explain it.

The cells it reads

Operational risk: losses and recoveries by business lines and event types in the last year (C 17.01.a)

Rows

  • 0050Maximum single loss
  • 0150Maximum single loss
  • 0250Maximum single loss
  • 0350Maximum single loss
  • 0450Maximum single loss
  • 0550Maximum single loss
  • 0650Maximum single loss
  • 0750Maximum single loss
  • 0850Maximum single loss
  • 0950Maximum single loss

Columns

  • 0010INTERNAL FRAUD
  • 0020EXTERNAL FRAUD
  • 0030EMPLOYMENT PRACTICES AND WORKPLACE SAFETY
  • 0040CLIENTS, PRODUCTS & BUSINESS PRACTICES
  • 0050DAMAGE TO PHYSICAL ASSETS
  • 0060BUSINESS DISRUPTION AND SYSTEM FAILURES
  • 0070EXECUTION, DELIVERY & PROCESS MANAGEMENT
Show the rule as writtenShow

EBA's formula, as written out for the first of its checks. Cells are written as {template, row, column, sheet}.

{C_17.01.a,r0950,c0010,} = max({C_17.01.a,r0050,c0010,},{C_17.01.a,r0150,c0010,},{C_17.01.a,r0250,c0010,},{C_17.01.a,r0350,c0010,},{C_17.01.a,r0450,c0010,},{C_17.01.a,r0550,c0010,},{C_17.01.a,r0650,c0010,},{C_17.01.a,r0750,c0010,},{C_17.01.a,r0850,c0010,})

The next five:

{C_17.01.a,r0950,c0060,} = max({C_17.01.a,r0050,c0060,},{C_17.01.a,r0150,c0060,},{C_17.01.a,r0250,c0060,},{C_17.01.a,r0350,c0060,},{C_17.01.a,r0450,c0060,},{C_17.01.a,r0550,c0060,},{C_17.01.a,r0650,c0060,},{C_17.01.a,r0750,c0060,},{C_17.01.a,r0850,c0060,}){C_17.01.a,r0950,c0070,} = max({C_17.01.a,r0050,c0070,},{C_17.01.a,r0150,c0070,},{C_17.01.a,r0250,c0070,},{C_17.01.a,r0350,c0070,},{C_17.01.a,r0450,c0070,},{C_17.01.a,r0550,c0070,},{C_17.01.a,r0650,c0070,},{C_17.01.a,r0750,c0070,},{C_17.01.a,r0850,c0070,}){C_17.01.a,r0950,c0040,} = max({C_17.01.a,r0050,c0040,},{C_17.01.a,r0150,c0040,},{C_17.01.a,r0250,c0040,},{C_17.01.a,r0350,c0040,},{C_17.01.a,r0450,c0040,},{C_17.01.a,r0550,c0040,},{C_17.01.a,r0650,c0040,},{C_17.01.a,r0750,c0040,},{C_17.01.a,r0850,c0040,}){C_17.01.a,r0950,c0050,} = max({C_17.01.a,r0050,c0050,},{C_17.01.a,r0150,c0050,},{C_17.01.a,r0250,c0050,},{C_17.01.a,r0350,c0050,},{C_17.01.a,r0450,c0050,},{C_17.01.a,r0550,c0050,},{C_17.01.a,r0650,c0050,},{C_17.01.a,r0750,c0050,},{C_17.01.a,r0850,c0050,}){C_17.01.a,r0950,c0020,} = max({C_17.01.a,r0050,c0020,},{C_17.01.a,r0150,c0020,},{C_17.01.a,r0250,c0020,},{C_17.01.a,r0350,c0020,},{C_17.01.a,r0450,c0020,},{C_17.01.a,r0550,c0020,},{C_17.01.a,r0650,c0020,},{C_17.01.a,r0750,c0020,},{C_17.01.a,r0850,c0020,})

And 1 more, the same formula for the other cells it covers.

Every COREP own funds rule, by template

Checks like this one, run at the point of submission, are the first step to real-time supervision.