Moving planned activities
Activities can be moved either by dragging and dropping or using the Move planned activities option available on the action panel. If more than one planned activity is selected, you can move one of the activities to a specific date, and the other activities will also be moved.
You can move a planned activity if no maintenance order has been generated for it yet and it has not been derived from a planning detail with a fixed completion schedule. Additionally, the planned activity must be in a planned state, and must not be archived.
Note  
*You cannot choose read-only planned activities. If you try to include them in a drag and drop operation, the system automatically removes them from the selection.