Rules/Peppol BIS Billing 3.0/Warning
DE-R-026
Peppol BIS Billing 3.0.21If both supplier and customer are located in Germany, and if "Invoice type code" (BT-3) contains the code 384 (Corrected invoice), "PRECEDING INVOICE REFERENCE" (BG-3) should be provided at least once.
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.