Sort parameter for expense reports. Accepts one or more sorting criteria in the format property:direction, where property is one of name, dateCreated, sent, reportNumber, ownerName, totalAmount, organizationName, organizationNumber, approved, lastUpdated, paid, status, employeeId, dueDate; and direction is either asc or desc. Multiple criteria can be provided as a comma-separated list. Default is lastUpdated:desc. Company card listings (companyCardOnly=true) always append owner last name ascending as a secondary sort, so the order within tied values is stable across pages.