Message

Dutch VAT numbers (9944) MUST be stated in the correct format (NL123456789B12).

Context
cbc:EndpointID[@schemeID = '9944'] | cac:PartyIdentification/cbc:ID[@schemeID = '9944'] | cbc:CompanyID[@schemeID = '9944']
Test
matches(normalize-space(), '^NL[0-9]{9}B[0-9]{2}$')
Usage
/ ubl:Invoice / cac:AccountingSupplierParty / cac:Party / cbc:EndpointID
/ ubl:Invoice / cac:AccountingSupplierParty / cac:Party / cac:PartyIdentification / cbc:ID
/ ubl:Invoice / cac:AccountingSupplierParty / cac:Party / cac:PartyTaxScheme / cbc:CompanyID
/ ubl:Invoice / cac:AccountingCustomerParty / cac:Party / cbc:EndpointID
/ ubl:Invoice / cac:AccountingCustomerParty / cac:Party / cac:PartyIdentification / cbc:ID
/ ubl:Invoice / cac:AccountingCustomerParty / cac:Party / cac:PartyTaxScheme / cbc:CompanyID
/ ubl:CreditNote / cac:AccountingSupplierParty / cac:Party / cbc:EndpointID
/ ubl:CreditNote / cac:AccountingSupplierParty / cac:Party / cac:PartyIdentification / cbc:ID
/ ubl:CreditNote / cac:AccountingSupplierParty / cac:Party / cac:PartyTaxScheme / cbc:CompanyID
/ ubl:CreditNote / cac:AccountingCustomerParty / cac:Party / cbc:EndpointID
/ ubl:CreditNote / cac:AccountingCustomerParty / cac:Party / cac:PartyIdentification / cbc:ID
/ ubl:CreditNote / cac:AccountingCustomerParty / cac:Party / cac:PartyTaxScheme / cbc:CompanyID