BR-KSA-71
If the Invoice is a simplified invoice type and is a summary invoice (KSA-2, position 1 and 2 = 02, position 6 = 1),then the buyer name must be present.
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.
cbc:InvoiceTypeCode[substring(@name, 1, 2) = '02']
not(exists(//cac:AccountingCustomerParty/cac:Party//cac:PartyLegalEntity/cbc:RegistrationName) and //cac:AccountingCustomerParty/cac:Party//cac:PartyLegalEntity/cbc:RegistrationName !='')
Checked with Saudi Arabia ZATCA Tax Invoice (UBL), Saudi Arabia ZATCA Simplified Tax Invoice (UBL)