How To Fix DMU166 - Material &1 for node &2 is not classified in class &3

SAP Error Message - Details

• Message type: E = Error

• Message class: DMU - Digital Mock Up (DMU)

• Message number: 166

• Message text: Material &1 for node &2 is not classified in class &3

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.

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Smart SAP Assistant

• What is the cause and solution for SAP error message DMU166 - Material &1 for node &2 is not classified in class &3 ?

  The SAP error message DMU166 indicates that a specific material (denoted as &1) for a particular node (denoted as &2) is not classified in the specified class (denoted as &3). This error typically arises in the context of classification and master data management within SAP, particularly when dealing with materials and their classification in the system.
  Cause:
  
  Missing Classification: The material in question has not been assigned to the specified classification class. This could happen if the material was created without proper classification or if the classification data was not maintained correctly.
  Incorrect Class Assignment: The material may have been assigned to a different class or may not belong to the class specified in the error message.
  Data Inconsistency: There may be inconsistencies in the master data, such as missing or incorrect entries in the classification system.
  
  Solution:
  
  
  Check Material Classification:
  
  Go to the material master data (transaction code MM03) and check if the material is classified under the correct class.
  If it is not classified, you can classify the material by using transaction code CL02 (Change Class) or CL01 (Create Class) to assign it to the appropriate class.
  
  
  
  Assign Material to Class:
  
  If the material is not assigned to any class, you can assign it by navigating to the classification view of the material master and adding it to the relevant class.
  
  
  
  Review Class Configuration:
  
  Ensure that the class specified in the error message is correctly configured and that the material type is allowed to be classified under that class.
  
  
  
  Check for Data Consistency:
  
  Run consistency checks on the classification data to identify any discrepancies or missing links between materials and their classes.
  
  
  
  Consult Documentation:
  
  Review SAP documentation or help resources for additional guidance on classification and material management.
  
  
  
  Related Information:
  
  Transaction Codes:
  
  MM03: Display Material
  CL02: Change Class
  CL01: Create Class
  CL03: Display Class
  
  
  Classification System: Understand how the classification system works in SAP, including classes, characteristics, and how materials are linked to these classes.
  Material Master Data: Familiarize yourself with the structure and importance of material master data in SAP, including views and fields relevant to classification.
  
  By following these steps, you should be able to resolve the DMU166 error and ensure that the material is properly classified in the system.