How To Fix CN602 - Network contains more than the nine loops found

SAP Error Message - Details

• Message type: E = Error

• Message class: CN - Meldungen für Netzpläne

• Message number: 602

• Message text: Network contains more than the nine loops found

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message CN602 - Network contains more than the nine loops found ?

  The SAP error message CN602 ("Network contains more than the nine loops found") 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 the system has detected more than nine loops in the network structure, which can complicate the scheduling and execution of tasks.
  Cause:
  
  Complex Network Structure: The primary cause of this error is a complex network structure that has more than nine loops. Loops can occur when there are multiple dependencies or relationships between activities that create circular references.
  Incorrect Dependencies: Incorrectly defined relationships between tasks (e.g., finish-to-start, start-to-start) can lead to the creation of loops.
  Excessive Activities: A network with too many activities and interdependencies can exceed the system's limit for loop detection.
  
  Solution:
  
  Analyze the Network: Review the network structure to identify and analyze the dependencies between activities. Look for circular references or unnecessary dependencies that can be removed or simplified.
  Limit Dependencies: Try to limit the number of dependencies between activities. If possible, break down complex tasks into smaller, more manageable components.
  Reorganize Activities: Consider reorganizing the activities in the network to eliminate loops. This may involve changing the sequence of tasks or redefining relationships.
  Use Alternative Planning Methods: If the network is too complex, consider using alternative planning methods or tools that can handle more complex structures without running into this limitation.
  Consult Documentation: Refer to SAP documentation or help resources for specific guidelines on network planning and loop management.
  
  Related Information:
  
  SAP Notes: Check SAP Notes for any updates or patches related to this error. Sometimes, SAP releases notes that provide fixes or workarounds for specific issues.
  Transaction Codes: Familiarize yourself with relevant transaction codes such as CN21 (Create Network), CN22 (Change Network), and CN41 (Network Overview) to manage networks effectively.
  Training and Support: If the issue persists, consider reaching out to SAP support or consulting with a professional who specializes in SAP Project System for further assistance.
  
  By addressing the underlying causes and following the suggested solutions, you should be able to resolve the CN602 error and streamline your network planning process in SAP.