Rules/EN 16931/Warning
BR-51
Peppol BIS Billing 3.0.21In accordance with card payments security standards an invoice should never include a full card primary account number (BT-87). At the moment PCI Security Standards Council has defined that the first 6 digits and last 4 digits are the maximum number of digits to be shown.
This rule has no plain-English explanation of our own yet. The official text above is exact.
A warning does not make the document invalid. Receivers may still act on it, so it is worth fixing.
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The full Peppol BIS Billing 3.0.21 rulebook, filterable.