fatalPeppol BIS Billing 3.0profileUBLBG-17BT-81
If "Payment means type code" (BT-81) contains a code for credit transfer (30, 58), "CREDIT TRANSFER" (BG-17) shall be provided.
The payment means code says credit transfer (30 or 58), but the matching CREDIT TRANSFER (BG-17) group is missing, so the buyer has no instructions to pay by that method.
Add CREDIT TRANSFER (BG-17) with its details — for a transfer the IBAN (BT-84), for a card the masked PAN and holder name, for a direct debit the mandate reference and the debited account. Or change BT-81 to the method you actually mean.
UBL — context (/ubl-invoice:Invoice/cac:PaymentMeans[cbc:PaymentMeansCode = (30,58)] | /ubl-creditnote:CreditNote/cac:PaymentMeans[cbc:PaymentMeansCode = (30,58)])[$supplierCountryIsDE and $customerCountryIsDE]
cac:PayeeFinancialAccount