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Warning

CII-SR-444: Remove the payer account's ProprietaryID

In short

Warning: worth checking.

CII-SR-444 means your CII invoice contains ProprietaryID within PayerPartyDebtorFinancialAccount in the header payment means. Remove that element. For direct debit, record the actual IBAN of the account to be debited (BT-91) in IBANID.

On this page

What it means

The check requires SpecifiedTradeSettlementPaymentMeans/PayerPartyDebtorFinancialAccount/ProprietaryID to be absent under ApplicableHeaderTradeSettlement. It does not itself require an IBAN or check whether an account is valid.

Why it matters

ProprietaryID is not the supported CII representation for the account to be debited. This is a check of the XML element, not proof that the bank account itself is invalid.

How to fix it

Remove ProprietaryID from the affected PayerPartyDebtorFinancialAccount, rather than deleting the whole account automatically. For direct debit, put the account's actual IBAN in IBANID for BT-91. Do not turn a proprietary account number into an IBAN merely by renaming its element. Recheck your file.

Once the file is corrected, check it again for free: Validate an invoice against EN 16931

Or fix the invoice in a form and download the corrected file, for 1 credit: Fix a rejected e-invoice

The rule as published

ProprietaryID should not be present

Where this rule applies

Rule set Version
EN 16931 (CII) 1.3.17
XRechnung 3.0 (CII) 3.0.2
NLCIUS (CII) 1.0.3.13
France CTC (CII) 1.4.0-04
Rule text from phive-rules 4.6.4.

Check your file

Drop your e-invoice to see whether CII-SR-444 still fails, and which other rules do.

Updated 6 November 2026