How To Fix WRF_APC066 - Material category for material &1 is blank

SAP Error Message - Details

• Message type: E = Error

• Message class: WRF_APC - Messages for Operational Assortment Planning and Control

• Message number: 066

• Message text: Material category for material &1 is blank

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message WRF_APC066 - Material category for material &1 is blank ?

  Certainly! Here's a detailed explanation for the SAP error message:
  
  SAP Error Message:
  WRF_APC066: Material category for material &1 is blank
  
  Cause:
  This error occurs because the Material Category field for the specified material (&1) is not maintained or is left blank in the material master data. The material category is a mandatory field in many SAP processes, especially in areas like Production Planning (PP), Sales and Distribution (SD), and Variant Configuration (VC). Without a valid material category, the system cannot correctly process the material in certain transactions or functions.
  
  Explanation:
  
  The material category defines the type of material and controls how the material is processed in the system.
  It influences the behavior of the material in various modules, such as whether it is a raw material, finished product, trading good, etc.
  If this field is blank, the system cannot determine the material's characteristics and thus throws this error.
  
  
  Solution:
  
  
  Check the Material Master:
  
  Go to transaction MM02 (Change Material).
  Enter the material number that caused the error.
  Navigate to the Basic Data 1 view.
  Check the field Material Category (usually field MATKL or MTART depending on context).
  If it is blank, assign the correct material category.
  
  
  
  Save the Material Master:
  
  After entering the correct material category, save the changes.
  
  
  
  Re-run the process:
  
  Retry the transaction or process that triggered the error.
  
  
  
  
  Additional Information:
  
  Material Category (MTART): This is a key field in the material master that defines the material type (e.g., ROH for raw materials, FERT for finished products).
  Material Group (MATKL): Sometimes confused with material category, but material group is for grouping materials for reporting and pricing.
  The error message WRF_APC066 is often encountered in Variant Configuration (VC) or Advanced Planning and Optimization (APO) scenarios where material master data integrity is critical.
  If the material category is missing due to data migration or incomplete master data creation, ensure that master data creation processes include mandatory fields.
  
  
  Summary:
  
  
  
  Aspect
  Details
  
  
  
  
  Error
  WRF_APC066: Material category is blank
  
  
  Cause
  Material category field in material master is empty
  
  
  Solution
  Maintain the material category in MM02 under Basic Data 1
  
  
  Transaction
  MM02 (Change Material)
  
  
  Related Areas
  Variant Configuration, APO, PP, SD
  
  
  
  
  If you need help identifying the correct material category, consult your SAP functional team or refer to your organization's material master data standards.
  
  Let me know if you need further assistance!