To schedule both the network and the maintenance orders, you have to consider that the maintenance orders must be assigned to WBS elements. This means that you have to link the maintenance orders to WBS elements in your project structure using assignment objects. This way, you can ensure that the dates of the maintenance orders are synchronized with the dates of the WBS elements and the network activities. You can also use overall network scheduling to schedule several networks and maintenance orders together. Reference: https://help.sap.com/docs/SAP_S4HANA_ON-PREMISE/4dd8cb7b1