Rules/Peppol BIS Billing 3.0/Error
PEPPOL-EN16931-R003
Peppol BIS Billing 3.0.21A buyer reference or purchase order reference MUST be provided.
In plain English
Peppol needs something the buyer can use to route the invoice internally. Neither a buyer reference (BT-10) nor a purchase order reference (BT-13) was present.
How to fix it
Add the buyer's purchase order number as cac:OrderReference/cbc:ID, or their reference as cbc:BuyerReference.
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