# DK-R-013

Source: https://xmlvalid.com/rules/DK-R-013

> For Danish Suppliers it is mandatory to use schemeID when PartyIdentification/ID is used for AccountingCustomerParty or AccountingSupplierParty

- Level: error
- Rule sets: Peppol BIS Billing 3.0 rules 3.0.21
- Context: `ubl-creditnote:CreditNote[$DKSupplierCountry = 'DK' and $DKCustomerCountry = 'DK']/cac:AccountingSupplierParty/cac:Party/cac:PartyIdentification | ubl-creditnote:CreditNote[$DKSupplierCountry = 'DK' and $DKCustomerCountry = 'DK']/cac:AccountingCustomerParty/cac:Party/cac:PartyIdentification | ubl-invoice:Invoice[$DKSupplierCountry = 'DK' and $DKCustomerCountry = 'DK']/cac:AccountingSupplierParty/cac:Party/cac:PartyIdentification | ubl-invoice:Invoice[$DKSupplierCountry = 'DK' and $DKCustomerCountry = 'DK']/cac:AccountingCustomerParty/cac:Party/cac:PartyIdentification`
- Test: `not((boolean(cbc:ID)) and (normalize-space(cbc:ID/@schemeID) = '') )`

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