In the SAP Project System, there are different sets of dates that can be scheduled for a network. Some of these sets of dates are:

Planned dates: These are the dates that you enter manually for the network activities and relationships. You can use planned dates to define your own scheduling scenario that may differ from the system-calculated dates.

Forecast dates: These are the dates that are calculated by the system based on the current progress and status of the network activities and relationships. You can use forecast dates to estimate the future dates of the network based on the actual data and remaining work. Reference: https://help.sap.com/docs/SAP_S4HANA_ON- PREMISE/4dd8cb7b1c484b4b93af84d00f60fdb8/0673b65334e6b54ce10000000a174cb4.html