How To Fix CN401 - Maintain fixed date only or reference to activity

CN401 - Overview

• Message type: E = Error

• Message class: CN - Meldungen für Netzpläne

• Message number: 401

• Message text: Maintain fixed date only or reference to activity

What causes this issue?

When you enter a date for a milestone, you must note:
either enter a fixed date
or enter an offset of the milestone to the activity, for example, an
offset to the start or the key <LS>Start/fin.</>

System Response

INCLUDE 'NA_ALLG_NOVERARBEITUNG' OBJECT DOKU ID TX

How to fix this error?

Enter either
a fixed date
or an offset to start or finish
or the key <LS>Start/fin.</>

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message CN401 - Maintain fixed date only or reference to activity ?

  The SAP error message CN401 typically occurs in the context of project management and is related to the scheduling of activities within a project. The message indicates that a fixed date must be maintained for the activity or that a reference to another activity should be established. Here’s a breakdown of the cause, solution, and related information for this error:
  
  Cause:
  
  Missing Fixed Date: The activity you are trying to schedule does not have a fixed date assigned to it. In project management, certain activities require a specific start or finish date to ensure proper scheduling and resource allocation.
  Reference Activity Not Defined: The activity may need to reference another activity that has a defined date. This is often necessary for dependencies between tasks.
  Project Settings: The project settings may require that all activities have either a fixed date or a reference to another activity, and if neither is provided, the error will be