# DE-R-031

Source: https://xmlvalid.com/rules/DE-R-031

> If both supplier and customer are located in Germany, and if the group "DIRECT DEBIT" (BG-19) is delivered, the element "Debited account identifier" (BT-91) shall be provided.

- Level: error
- Rule sets: Peppol BIS Billing 3.0 rules 3.0.21
- Context: `(/ubl-invoice:Invoice | /ubl-creditnote:CreditNote)[$supplierCountryIsDE and $customerCountryIsDE]`
- Test: `not(cac:PaymentMeans/cac:PaymentMandate) or (cac:PaymentMeans/cac:PaymentMandate/cac:PayerFinancialAccount/cbc:ID)`

Validate a document against these rules: https://xmlvalid.com/validate