Partial confirmation of activities is a planning method that allows you to confirm a part of an activity's duration or work. This prevents further rescheduling of the activity because the confirmed part is fixed and cannot be changed. The remaining part of the activity can still be rescheduled according to the project progress and resource availability. Reference: https://help.sap.com/viewer/0c9a2f8f9c1b4a2e8b3f7d0c9b6e1d8a/2020.000/en-US/4c5f7a3e6b571014e10000000a174cb4.html