BR-KSA-92

If it's a B2G invoice transaction type (KSA 2, position 9 = 01), then the Contract ID (BT-12) must be present in a tax invoice and associated credit notes and debit notes (KSA-2, position 1 and 2 = 01).

error: the document is invalid

What the rule checks

As the rule set's publisher wrote it. The rule runs on every element the context matches, and fails where the test is false; the validator reports the line of that element.

Context
/ubl:Invoice | /cn:CreditNote
Test
not(exists(cac:ContractDocumentReference/cbc:ID))

Checked with Saudi Arabia ZATCA Tax Invoice (UBL), Saudi Arabia ZATCA Simplified Tax Invoice (UBL)