Rules/Peppol BIS Billing 3.0/Warning

DE-R-017

Peppol BIS Billing 3.0.21

If both supplier and customer are located in Germany, the element "Invoice type code" (BT-3) should only contain the following values from code list UNTDID 1001: 326 (Partial invoice), 380 (Commercial invoice), 384 (Corrected invoice), 389 (Self-billed invoice), 381 (Credit note), 875 (Partial construction invoice), 876 (Partial final construction invoice), 877 (Final construction invoice).

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.