How To Fix CN659 - First selected relationship already reached

SAP Error Message - Details

• Message type: E = Error

• Message class: CN - Meldungen für Netzpläne

• Message number: 659

• Message text: First selected relationship already reached

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

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.

Unfortunately, there isn't any extra information in this error notice.

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Smart SAP Assistant

• What is the cause and solution for SAP error message CN659 - First selected relationship already reached ?

  The SAP error message CN659 ("First selected relationship already reached") typically occurs in the context of project management and network planning within SAP, particularly when dealing with relationships between activities in a project.
  Cause:
  This error usually arises when you are trying to create or modify a relationship between activities in a project network, and the system detects that the relationship you are trying to establish has already been defined. Essentially, it indicates that the first selected relationship (the predecessor or successor) has already been reached or established, and you cannot create a duplicate or conflicting relationship.
  Solution:
  To resolve this error, you can take the following steps:
  
  
  Check Existing Relationships: Review the existing relationships between the activities in your project. Ensure that you are not trying to create a duplicate relationship. You can do this by navigating to the project network and examining the relationships defined for the activities involved.
  
  
  Modify Existing Relationships: If you find that the relationship you are trying to create already exists, consider modifying the existing relationship instead of creating a new one. You can change the type of relationship or adjust the timing as needed.
  
  
  Delete Conflicting Relationships: If there are conflicting relationships that are causing the error, you may need to delete or adjust them to allow for the new relationship you want to create.
  
  
  Use the Correct Transaction: Ensure that you are using the correct transaction code for the task you are trying to perform. Sometimes, using the wrong transaction can lead to unexpected errors.
  
  
  Consult Documentation: If you are unsure about the relationships and how they should be structured, refer to SAP documentation or guidelines on project management and network planning.
  
  
  Seek Help from SAP Support: If the issue persists and you cannot identify the cause, consider reaching out to your SAP support team or consulting SAP notes for any known issues related to this error.
  
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as CN21 (Create Network), CN22 (Change Network), and CN41 (Display Network) to manage project networks effectively.
  Project Management Best Practices: Understanding best practices in project management can help you structure your activities and relationships more effectively, reducing the likelihood of encountering such errors.
  SAP Notes: Check SAP Notes for any updates or patches that may address this specific error or provide additional guidance.
  
  By following these steps, you should be able to resolve the CN659 error and manage your project relationships more effectively.