BR-KSA-17

Debit and credit note (invoice type code (BT-3) is equal to 383 or 381) must contain the reason (KSA-10) for this invoice type issuing.

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[cbc:InvoiceTypeCode = '381'] | /ubl:Invoice[cbc:InvoiceTypeCode = '383']
Test
exists(//cac:PaymentMeans/cbc:InstructionNote)

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