# BR-CIUS-PT-40

Source: https://xmlvalid.com/rules/BR-CIUS-PT-40

> The Buyer contact point (BT-56) or the Buyer contact telephone number (BT-57) or the Buyer contact email address (BT-58) shall be filled.

- Level: error
- Rule sets: CIUS-PT rules (Portugal, UBL) 2.1.1
- Context: `cac:AccountingCustomerParty`
- Test: `exists(cac:Party/cac:Contact) and (not(cac:Party/cac:Contact/cbc:Name) and not(cac:Party/cac:Contact/cbc:Telephone) and not(cac:Party/cac:Contact/cbc:ElectronicMail))`

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