[ibr-191-ae]- Payment means type code (ibt-081) must be provided except when the invoice type code (ibt-003) is 'Credit note' or "Credit note related to goods or services", or Invoice transaction-type code (BTAE-002) is X1XXXXXX (Deemed supply).
ibr-191-ae/ubl:Invoice | /cn:CreditNote((cbc:InvoiceTypeCode|cbc:CreditNoteTypeCode) = "81" or (cbc:InvoiceTypeCode|cbc:CreditNoteTypeCode) = "381" or (cbc:InvoiceTypeCode|cbc:CreditNoteTypeCode) = "261" or matches(cbc:ProfileExecutionID, "^[01]1[01]{6}$")) or exists(cac:PaymentMeans/cbc:PaymentMeansCode)