How To Fix WM390 - Not only mat.grp classes (026) are in use - all other mat. classes too

SAP Error Message - Details

• Message type: E = Error

• Message class: WM - IS-R Assortments

• Message number: 390

• Message text: Not only mat.grp classes (026) are in use - all other mat. classes too

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message WM390 - Not only mat.grp classes (026) are in use - all other mat. classes too ?

  The SAP error message WM390 indicates that there is an issue with the material group classification in the Warehouse Management (WM) module. Specifically, it suggests that the system is trying to process a material that is not only associated with the specified material group class (026) but also with other material classes. This can lead to confusion in the system regarding how to handle the materials.
  Cause:
  
  Material Classification: The material in question is classified under multiple material groups or classes, which can lead to conflicts in processing.
  Configuration Issues: There may be a misconfiguration in the material master data or in the warehouse management settings that does not align with the expected material group classes.
  Data Integrity Issues: There could be inconsistencies in the data, such as incorrect entries in the material master or warehouse management settings.
  
  Solution:
  
  
  Check Material Master Data:
  
  Go to the material master record (transaction code MM03) and check the classification of the material. Ensure that it is assigned to the correct material group and that there are no conflicting entries.
  
  
  
  Review Material Group Configuration:
  
  Check the configuration settings for material groups in the system (transaction code SPRO). Ensure that the material group classes are set up correctly and that there are no overlaps or conflicts.
  
  
  
  Adjust Warehouse Management Settings:
  
  Review the settings in the Warehouse Management module to ensure that they are aligned with the material classifications. This includes checking the warehouse process types and their associated material classes.
  
  
  
  Data Consistency Check:
  
  Run a data consistency check to identify any discrepancies in the material master data or warehouse management settings. This can help pinpoint the source of the issue.
  
  
  
  Consult Documentation:
  
  Refer to SAP documentation or help notes related to WM390 for additional insights and troubleshooting steps.
  
  
  
  Contact SAP Support:
  
  If the issue persists after checking the above points, consider reaching out to SAP support for further assistance. They may provide specific notes or patches that address this error.
  
  
  
  Related Information:
  
  Material Group Classes: Material group classes are used in SAP to categorize materials for various purposes, including reporting and inventory management.
  Warehouse Management (WM): This module in SAP is responsible for managing warehouse operations, including inventory management, picking, and shipping.
  Transaction Codes: Familiarize yourself with relevant transaction codes such as MM03 (Display Material), SPRO (Customizing), and WM-related transactions for managing warehouse processes.
  
  By following these steps, you should be able to resolve the WM390 error and ensure that your material classifications are correctly set up in the SAP system.