# BR-KSA-37

Source: https://xmlvalid.com/rules/BR-KSA-37

> The seller address building number must contain 4 digits.

- Level: warning
- Rule sets: ZATCA e-invoicing rules (Saudi Arabia) SDK 3.4.6
- Context: `cac:AccountingSupplierParty/cac:Party`
- Test: `matches(cac:PostalAddress/cbc:BuildingNumber, '^[0-9]{4}$')`

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