How To Fix KN129 - Selection interface for classification set as default

SAP Error Message - Details

• Message type: E = Error

• Message class: KN - Reporting for Costing

• Message number: 129

• Message text: Selection interface for classification set as default

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.

What else can you do?

First, use our AnswerBot below to get a possible cause and solution (requires a premium subscription).

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.

You can also try searching the SAP support portal (support.sap.com) but you need a special user ID to access it. It is possible that an SAP support note exists that provides additional details about the mistake or even steps for fixing it.

Smart SAP Assistant

• What is the cause and solution for SAP error message KN129 - Selection interface for classification set as default ?

  The SAP error message KN129, which states "Selection interface for classification set as default," typically occurs in the context of material master data or customer/vendor master data when there is an issue with the classification settings in the system.
  Cause:
  The error usually arises due to one of the following reasons:
  
  Default Settings: The system is trying to use a classification selection interface that has not been properly set up or is not available.
  Missing Configuration: The classification system may not be configured correctly, or the necessary classification types may not be assigned to the relevant master data.
  User Authorizations: The user may not have the necessary authorizations to access the classification data or to make changes to the settings.
  
  Solution:
  To resolve the KN129 error, you can take the following steps:
  
  
  Check Classification Settings:
  
  Go to the transaction code CL02 (Change Class) or CL01 (Create Class) to verify if the classification types are correctly defined.
  Ensure that the classification system is properly configured and that the relevant classes and characteristics are assigned.
  
  
  
  Set Default Selection Interface:
  
  Navigate to the configuration settings for the classification system (transaction code SPRO).
  Under the path: Logistics - General > Master Data > Classification > Define Selection Interface, check if a default selection interface is set. If not, you may need to define one.
  
  
  
  User Authorizations:
  
  Ensure that the user has the necessary authorizations to access and modify classification data. This can be checked with the help of your SAP security team.
  
  
  
  Check for Notes and Updates:
  
  Sometimes, SAP releases notes or patches that address specific issues. Check the SAP Support Portal for any relevant notes related to the KN129 error.
  
  
  
  Consult Documentation:
  
  Review the SAP documentation for classification and master data management to ensure that all necessary steps have been followed in the configuration.
  
  
  
  Testing:
  
  After making the necessary changes, test the process again to see if the error persists.
  
  
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as CL01, CL02, CL03 (Display Class), and MM01 (Create Material) or XD01 (Create Customer) as they may be involved in the classification process.
  SAP Notes: Search for SAP Notes related to classification and the KN129 error for any specific fixes or recommendations.
  SAP Community: Engage with the SAP Community forums for insights from other users who may have encountered and resolved similar issues.
  
  If the problem persists after following these steps, it may be beneficial to consult with an SAP expert or your internal SAP support team for further assistance.