Rules/Peppol BIS Billing 3.0/Warning

DE-R-026

Peppol BIS Billing 3.0.21
If 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.
Official rule text

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A warning does not make the document invalid. Receivers may still act on it, so it is worth fixing.

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