[IBR-171-OM] - Invoice issue date (IBT-002) MUST NOT be a future date (evaluated in Asia/Muscat, UTC+04:00).
IBR-171-OMubl:Invoice | cn:CreditNotenot(cbc:IssueDate) or (cbc:IssueDate castable as xs:date and xs:date(cbc:IssueDate) <= xs:date(adjust-dateTime-to-timezone(current-dateTime(), xs:dayTimeDuration('PT4H'))))