When is the Open main work indicator on the Maintenance Order Header deselected?

 According to the SAP S/4HANA Cloud, public edition Learning Journey1, when you set the status of a maintenance order with actual costs to Technically Complete (TECO), it means that final time confirmation has been posted for all main operations of a maintenance order. TECO is a system status that indicates that no further changes are allowed on a maintenance order and that the maintenance work is technically complete. Final time confirmation is a process that records the actual time spent on performing the maintenance work for each operation of a maintenance order. Main operations are operations that are directly related to the maintenance work on an asset or equipment.