Message

If the group "DIRECT DEBIT" (BG-19) is delivered, the element "Bank assigned creditor identifier" (BT-90) shall be provided.

Context
(/ubl-invoice:Invoice | /ubl-creditnote:CreditNote)[$supplierCountryIsDE and $customerCountryIsDE]
Test
not(cac:PaymentMeans/cac:PaymentMandate) or (cac:AccountingSupplierParty/cac:Party/cac:PartyIdentification/cbc:ID[@schemeID='SEPA'] | cac:PayeeParty/cac:PartyIdentification/cbc:ID[@schemeID='SEPA'])
Usage
/ ubl:Invoice / cac:AccountingSupplierParty / cac:Party / cac:PartyIdentification / cbc:ID
/ ubl:Invoice / cac:PayeeParty / cac:PartyIdentification / cbc:ID
/ ubl:Invoice / cac:PaymentMeans / cac:PaymentMandate / cbc:ID
/ ubl:CreditNote / cac:AccountingSupplierParty / cac:Party / cac:PartyIdentification / cbc:ID
/ ubl:CreditNote / cac:PayeeParty / cac:PartyIdentification / cbc:ID
/ ubl:CreditNote / cac:PaymentMeans / cac:PaymentMandate / cbc:ID