# F-LIB191

Source: https://xmlvalid.com/rules/F-LIB191

> schemeID = DK:CPR, CompanyID must be a valid CPR number (like '1234560000', value found: '…')

- Level: error
- Rule sets: OIOUBL 2.1 Invoice rules (Denmark) 1.17.2, OIOUBL 2.1 Credit Note rules (Denmark) 1.17.2, OIOUBL 2.1 Reminder rules (Denmark) 1.17.2
- Test: `(cbc:CompanyID/@schemeID = 'DK:CPR') and not(string-length(cbc:CompanyID) = 10)`

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