# DE-R-011

Source: https://xmlvalid.com/rules/DE-R-011

> If both supplier and customer are located in Germany, the element "Deliver to post code" (BT-78) shall be provided if the group "DELIVER TO ADDRESS" (BG-15) is delivered.

- Level: error
- Rule sets: Peppol BIS Billing 3.0 rules 3.0.21
- Context: `(/ubl-invoice:Invoice/cac:Delivery/cac:DeliveryLocation/cac:Address | /ubl-creditnote:CreditNote/cac:Delivery/cac:DeliveryLocation/cac:Address)[$supplierCountryIsDE and $customerCountryIsDE]`
- Test: `cbc:PostalZone[boolean(normalize-space(.))]`

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