# BR-KSA-68

Source: https://xmlvalid.com/rules/BR-KSA-68

> Tax currency code (BT-6) must exist in an invoice.

- Level: error
- Rule sets: ZATCA e-invoicing rules (Saudi Arabia) SDK 3.4.6
- Context: `/ubl:Invoice | /cn:CreditNote`
- Test: `exists(cbc:TaxCurrencyCode) and (cbc:TaxCurrencyCode) != ''`

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