Rules/Peppol BIS Billing 3.0/Warning
GR-S-011
Peppol BIS Billing 3.0.21Greek suppliers must provide their Seller Tax Registration Number, prefixed by the country code
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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