How To Fix CN603 - Network contains & loop(s)

CN603 - Overview

• Message type: E = Error

• Message class: CN - Meldungen für Netzpläne

• Message number: 603

• Message text: Network contains & loop(s)

Self-Explanatory Message

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To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

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Smart SAP Assistant

• What is the cause and solution for SAP error message CN603 - Network contains & loop(s) ?

  The SAP error message CN603 ("Network contains & loop(s)") typically occurs in the context of project management and network planning within SAP, particularly when dealing with networks in the Project System (PS) module. This error indicates that there is a loop in the network structure, which can prevent the system from processing the network correctly.
  
  Cause:
  The error is caused by the presence of circular dependencies in the network. This means that one or more activities in the network are incorrectly linked, creating a situation where the system cannot determine a clear path for execution. This can happen due to:
  
  Incorrectly Defined Relationships: Activities may have been linked in such a way that they point back to themselves or create a cycle.
  Manual Changes: Manual adjustments to the network structure that inadvertently create loops.
  Data Migration Issues: If data has been migrated from another system, it may have introduced inconsistencies or loops.
  
  
  Solution:
  To resolve the CN603