How To Fix W0000 - Combination material class type/ material class not found

SAP Error Message - Details

• Message type: E = Error

• Message class: W0 - Customizing - ISR

• Message number: 000

• Message text: Combination material class type/ material class not found

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message W0000 - Combination material class type/ material class not found ?

  Certainly! Here's a detailed explanation for the SAP error message:
  
  SAP Error Message:
  W0000 Combination material class type/ material class not found
  
  Cause:
  This warning message occurs when SAP cannot find a valid combination of material class type and material class during classification or when assigning a material to a class. Essentially, the system is trying to assign or reference a material class that does not exist or is not properly maintained for the specified material class type.
  Common scenarios include:  
  
  The material class you are trying to assign does not exist in the system.  
  The material class exists but is not assigned to the correct material class type.  
  The material class type is incorrect or not maintained.  
  Data inconsistencies or missing entries in classification tables (e.g., KLAH, KSSK).
  
  
  Explanation:
  
  Material Class Type: Defines the category or type of classification (e.g., 001 for material classes).  
  Material Class: The actual class within the class type (e.g., class 1000 under class type 001).  
  The system checks if the material class exists under the specified class type before allowing assignment or classification.
  
  
  Solution:
  
  
  Check Material Class and Class Type:  
  
  Go to transaction CL02 (Change Class) or CL03 (Display Class).  
  Verify that the material class exists and is assigned to the correct material class type.
  
  
  
  Maintain Material Class if Missing:  
  
  If the class does not exist, create it using CL01 (Create Class).  
  Ensure you select the correct material class type during creation.
  
  
  
  Verify Material Master Classification:  
  
  In transaction MM02 (Change Material), check the classification tab.  
  Confirm that the material class and class type are correctly assigned.
  
  
  
  Check Customizing Settings:  
  
  Use transaction SPRO ? Logistics General ? Classification System ? Basic Settings ? Define Material Class Types.  
  Ensure the material class type is properly defined and active.
  
  
  
  Data Consistency Check:  
  
  Run report or use transaction CL30N to check for inconsistencies in classification data.  
  If inconsistencies are found, correct or reassign the classes.
  
  
  
  Transport and System Issues:  
  
  If the class was recently created or changed, ensure that transports have been imported correctly into the system.
  
  
  
  
  Related Information:
  
  
  Tables involved:  
  
  KLAH: Class header (contains class type and class number).  
  KSSK: Object to class assignment (e.g., material to class).  
  KSSK and KSSK are key tables for classification data.
  
  
  
  Transactions:  
  
  CL01: Create Class  
  CL02: Change Class  
  CL03: Display Class  
  MM02: Change Material (classification tab)  
  SPRO: Customizing for classification system
  
  
  
  Notes and Documentation:  
  
  Check SAP Notes related to classification errors if the problem persists.  
  SAP Help Portal: Classification System documentation.
  
  
  
  
  Summary:
  The warning W0000 Combination material class type/ material class not found indicates that the system cannot find the specified material class under the given material class type. To resolve, verify and maintain the material class and class type correctly in the classification system and ensure proper assignment in the material master.
  
  If you need help with specific steps or screenshots, feel free to ask!