[ibr-124-ae]-VAT point date [IBT-007] MUST not be there when invoice type code (IBT-003) is 'credit note' or 'Credit note related to goods or services'.
ibr-124-ae/ubl:Invoice | /cn:CreditNotenot(cbc:InvoiceTypeCode = "381" or cbc:InvoiceTypeCode = "81") or not(cbc:TaxPointDate)