If "Payment means type code" (BT-81) contains a code for credit transfer (30, 58), "CREDIT TRANSFER" (BG-17) shall be provided.
(/ubl-invoice:Invoice/cac:PaymentMeans[cbc:PaymentMeansCode = (30,58)] | /ubl-creditnote:CreditNote/cac:PaymentMeans[cbc:PaymentMeansCode = (30,58)])[$supplierCountryIsDE and $customerCountryIsDE]cac:PayeeFinancialAccount