How To Fix WRF_BUDGET121 - Material class &1 is not assigned to the material group hierarchy

SAP Error Message - Details

• Message type: E = Error

• Message class: WRF_BUDGET -

• Message number: 121

• Message text: Material class &1 is not assigned to the material group hierarchy

Self-Explanatory Message

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• What is the cause and solution for SAP error message WRF_BUDGET121 - Material class &1 is not assigned to the material group hierarchy ?

  The SAP error message:
  WRF_BUDGET121 Material class &1 is not assigned to the material group hierarchy
  
  Cause:
  This error occurs when the system tries to process a material whose material class is not assigned or linked to the relevant material group hierarchy in the budgeting or controlling module. Essentially, the material class (a classification of materials) must be mapped to a material group hierarchy used in budgeting or cost controlling processes. If this assignment is missing, the system cannot correctly categorize or process the material for budget-related functions, triggering this error.
  
  Explanation:
  
  Material Class: A classification attribute assigned to materials to group them logically.
  Material Group Hierarchy: A hierarchical structure used in budgeting, controlling, or reporting to group materials for cost or budget tracking.
  The error indicates a missing link between these two, which is required for budget-related transactions or reports.
  
  
  Solution:
  
  
  Check Material Class Assignment:
  
  Verify the material class (&1 in the message) that is causing the error.
  Use transaction codes like MM03 to check the material class of the material.
  
  
  
  Assign Material Class to Material Group Hierarchy:
  
  Go to the customizing path for material group hierarchy assignment.
  Typically, this is done in SPRO under:
  Controlling (CO) -> Cost Element Accounting -> Cost Element Master Data -> Assign Material Classes to Material Group Hierarchy
  
  Or in budgeting-related customizing:
  Logistics General -> Material Master -> Settings for Key Fields -> Assign Material Classes to Material Group Hierarchy
  
  Assign the material class to the appropriate node in the material group hierarchy.
  
  
  
  Check Budgeting or Controlling Settings:
  
  Ensure that the budgeting or controlling module is correctly configured to use the material group hierarchy.
  Confirm that the material group hierarchy is active and correctly maintained.
  
  
  
  Test the Process Again:
  
  After assignment, reprocess the transaction or report that caused the error to confirm resolution.
  
  
  
  
  Additional Information:
  
  This error is common in scenarios involving budget control, cost controlling, or material valuation where material classification impacts budget or cost element assignment.
  Proper maintenance of material master data and controlling settings is crucial to avoid such errors.
  If you are unsure about the correct material group hierarchy or material class assignments, consult your controlling or budgeting team.
  
  
  Summary:
  
  
  
  Aspect
  Details
  
  
  
  
  Error Message
  WRF_BUDGET121 Material class &1 is not assigned to the material group hierarchy
  
  
  Cause
  Material class not linked to material group hierarchy required for budgeting/controlling
  
  
  Solution
  Assign the material class to the appropriate material group hierarchy in customizing
  
  
  Transaction Codes
  MM03 (Material display), SPRO (Customizing)
  
  
  Modules Involved
  Materials Management (MM), Controlling (CO), Budgeting
  
  
  
  
  If you need help with the exact customizing path or transaction, please provide your SAP system version or module context.