# BR-KSA-85

Source: https://xmlvalid.com/rules/BR-KSA-85

> The Buyer's contact phone number (BT-57) shall start with "0" or "+", followed by a maximum of 15 number and minimum 4 character after the "+" or "0" , if exist.

- Level: warning
- Rule sets: ZATCA e-invoicing rules (Saudi Arabia) SDK 3.4.6
- Context: `//cac:AccountingCustomerParty/cac:Party/cac:Contact`
- Test: `matches(//cac:AccountingCustomerParty/cac:Party/cac:Contact/cbc:Telephone, '^(?:0|\+)[0-9]{4,15}$')`

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