How To Fix CN837 - Relationships betw. activities in different alternatives are not allowed

CN837 - Overview

• Message type: E = Error

• Message class: CN - Meldungen für Netzpläne

• Message number: 837

• Message text: Relationships betw. activities in different alternatives are not allowed

What causes this issue?

You have entered a relationship to another alternative of the standard
network. This is not allowed.

System Response

INCLUDE 'NA_ALLG_NOVERARBEITUNG' OBJECT DOKU ID TX

How to fix this error?

Enter a different alternative.

Error message extract from SAP system. Copyright SAP SE.

CN837 - Details

• The SAP error message CN837, which states "Relationships between activities in different alternatives are not allowed," typically occurs in the context of project management within SAP, particularly when dealing with network activities in Project System (PS) or similar modules.
  
  Cause:
  This error arises when you attempt to create a dependency (relationship) between activities that belong to different alternatives in a project. In SAP, alternatives are used to represent different scenarios or options for executing a project. Each alternative can have its own set of activities, and relationships (like finish-to-start, start-to-start, etc.) can only be established within the same alternative.
  
  Solution:
  To resolve this error, you can take the following steps:
  
  
  Check Activity Alternatives: Review the activities involved in the relationship. Ensure that both activities are part of the same alternative. If they are not, you will need to either:
  
  Move one of the activities to the same alternative as the other.
  Create a new relationship that only