Basic dates and planned dates are some of the sets of dates that can be used to schedule networks. Basic dates are the earliest possible start and finish dates of an activity or a network, based on its dependencies and constraints. Planned dates are the scheduled start and finish dates of an activity or a network, based on its basic dates and available capacities. Reference:https://help.sap.com/doc/0f069b2e08b748f1b480d4c8b46c3c49/100/en-US/6a7a9f0a6e421014e10000000a174cb4.html