How To Fix CN135 - Specified assignment to standard network already exists

SAP Error Message - Details

• Message type: E = Error

• Message class: CN - Meldungen für Netzpläne

• Message number: 135

• Message text: Specified assignment to standard network already exists

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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Also, review the in-depth Common Questions & Answers listed below; you could discover a solution there or be able to connect with others who have faced similar challenges.

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Smart SAP Assistant

• What is the cause and solution for SAP error message CN135 - Specified assignment to standard network already exists ?

  The SAP error message CN135 ("Specified assignment to standard network already exists") typically occurs when you attempt to assign a component or activity to a standard network in SAP Project System (PS) or Production Planning (PP) and the assignment already exists. This can happen in various scenarios, such as when you are trying to add a material, activity, or resource that has already been assigned to the network.
  Cause:
  
  Duplicate Assignment: The most common cause is that the component or activity you are trying to assign is already linked to the standard network.
  Incorrect Data Entry: There may be a mistake in the data entry, leading to an attempt to create a duplicate assignment.
  System Configuration: Sometimes, system settings or configurations may lead to unexpected behavior, causing the system to think an assignment already exists.
  
  Solution:
  
  
  Check Existing Assignments:
  
  Navigate to the standard network in question and review the existing assignments. You can do this by using transaction codes like CN21 (for creating networks) or CN22 (for changing networks).
  Look for the component or activity you are trying to assign and verify if it is already listed.
  
  
  
  Remove Duplicate Assignment:
  
  If you find that the assignment already exists and is not needed, you can remove it. This can be done by selecting the existing assignment and deleting it.
  
  
  
  Modify the Assignment:
  
  If the existing assignment is valid but you need to change it, consider modifying the existing assignment instead of creating a new one.
  
  
  
  Check for Errors in Data Entry:
  
  Ensure that you are entering the correct details for the assignment. Double-check the component or activity number, and ensure there are no typos or incorrect references.
  
  
  
  Consult Documentation:
  
  Review SAP documentation or help files related to the Project System or Production Planning for additional guidance on managing assignments.
  
  
  
  Contact 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, CN22, CJ20N (for project management), and CJI3 (for project reports).
  SAP Notes: Search for SAP Notes related to error CN135 for any patches or updates that may address the issue.
  User Authorization: Ensure that you have the necessary authorizations to make changes to the network assignments.
  
  By following these steps, you should be able to resolve the CN135 error and successfully manage your network assignments in SAP.