Who can mark Xero Purchase Orders as Billed?

Who can mark Xero Purchase Orders as Billed?

Xero Purchase Orders can be marked as Billed by:
  1. Administrators of Organisations in ApprovalMax
  2. Purchase Order Requesters
  3. Persons who are specified in the "Pull from Xero" section of a Purchase Order approval workflow (if Purchase Orders get created in Xero and then pulled to ApprovalMax)
  4. Directly in Xero, the status will be synced to ApprovalMax