# PEPPOL-COMMON-R053

Source: https://xmlvalid.com/rules/PEPPOL-COMMON-R053

> Danish ERSTORG number (SE) MUST be stated in the correct format.

- Level: error
- Rule sets: Peppol BIS Billing 3.0 rules 3.0.21, Peppol Order rules 3.7, Peppol Order Response rules 3.2, Peppol Despatch Advice rules 3.5, Peppol Catalogue rules 3.5, Peppol Catalogue Response rules 3.0, Peppol Invoice Response rules 3.1, Peppol Message Level Response rules 3.0, Peppol Order Change rules 3.2, Peppol Order Cancellation rules 3.0
- Context: `cbc:EndpointID[@schemeID = '0198'] | cac:PartyIdentification/cbc:ID[@schemeID = '0198'] | cbc:CompanyID[@schemeID = '0198']`
- Test: `(string-length(string()) = 10 and substring(string(), 1, 2) = 'DK' and string-length(translate(substring(string(), 3, 8), '1234567890', '')) = 0)`

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