Missing data for time scheduling in project profile &

What causes this issue?

In project definition &V1&, you have not maintained all of the data
necessary for maintaining dates in the work breakdown structure.
The minimum requirement for planning dates is the maintenance of the
following in the project definition:
Planning method for the basic dates
Planning method for the forecast dates
Time unit
Network profile
Assignments to network

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

System Response

INCLUDE 'NA_ALLG_NOVERARBEITUNG' OBJECT DOKU ID TX

How to fix this error?

INCLUDE 'NA_ALLG_MOEGLICH' OBJECT DOKU ID TX
Fill in the missing data in project definition &V1&.
You can also change the network profile from time scheduling.

Error message extract from SAP system. Copyright SAP SE.