Diagnosis
Your project &V1& was created with the standard WBS &V2&.
In this situation, you cannot assign a network to the project.

System Response
INCLUDE 'NA_ALLG_NOFUNKTION' OBJECT DOKU ID TX

Procedure
INCLUDE 'NA_ALLG_MOEGLICH' OBJECT DOKU ID TX
RESET N1
Using "possible entries" select a project that was created with thisstandard WBS and then select copy.
Using Create project create a new project from the standard WBS.